feat: uniqCount aggregation

[cheb0]

Description

Fixes #295

---

• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.25000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.56%. Comparing base (b9c2c02) to head (a7c9b9b).

Files with missing lines	Patch %	Lines
frac/processor/aggregator.go	80.95%	2 Missing and 2 partials ⚠️
proxy/search/ingestor.go	63.63%	3 Missing and 1 partial ⚠️
storeapi/grpc_v1.go	0.00%	1 Missing and 1 partial ⚠️
cmd/seq-db/seq-db.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #298      +/-   ##
==========================================
+ Coverage   71.49%   71.56%   +0.06%     
==========================================
  Files         204      204              
  Lines       14857    14928      +71     
==========================================
+ Hits        10622    10683      +61     
- Misses       3471     3479       +8     
- Partials      764      766       +2     

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[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
FindSequence_Random/large-4	77fae2	b57eaa
	13987.92 MB/s	12082.33 MB/s	0.86	🔴
	1171.00 ns/op	1356.00 ns/op	1.16	🔴
FindSequence_Random/tiny-4	77fae2	b57eaa
	2850.02 MB/s	2536.33 MB/s	0.89	🔴
	22.46 ns/op	25.23 ns/op	1.12	🔴
GenerateDocs-4	77fae2	b57eaa
	949.50 ns/op	1121.00 ns/op	1.18	🔴

[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
Bitmask-4	6ae568	bd827e
	0.00 B/op	3.00 B/op	NaN	🔴
FindSequence_Random/medium-4	6ae568	bd827e
	13517.73 MB/s	10599.31 MB/s	0.78	🔴
	75.75 ns/op	96.61 ns/op	1.28	🔴
FindSequence_Random/small-4	6ae568	bd827e
	5683.27 MB/s	3417.27 MB/s	0.60	🔴
	45.04 ns/op	74.91 ns/op	1.66	🔴
GenerateDocs-4	6ae568	bd827e
	957.90 ns/op	1143.00 ns/op	1.19	🔴
ProcessDocuments-4	6ae568	bd827e
	4.00 allocs/op	5.00 allocs/op	1.25	🔴

[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
Bitmask-4	b9c2c0	cbceef
	0.00 B/op	3.00 B/op	NaN	🔴
FindSequence_Random/tiny-4	b9c2c0	cbceef
	2406.53 MB/s	2164.50 MB/s	0.90	🔴
	26.59 ns/op	29.57 ns/op	1.11	🔴
GenerateDocs-4	b9c2c0	cbceef
	935.60 ns/op	1166.00 ns/op	1.25	🔴

[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
FindSequence_Random/small-4	b9c2c0	5c34f9
	4713.98 MB/s	3836.26 MB/s	0.81	🔴
	54.31 ns/op	66.73 ns/op	1.23	🔴
GenerateDocs-4	b9c2c0	5c34f9
	935.60 ns/op	1151.00 ns/op	1.23	🔴

[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
Bitmask-4	b9c2c0	6e2b52
	0.00 B/op	3.00 B/op	NaN	🔴
FindSequence_Random/large-4	b9c2c0	6e2b52
	12632.84 MB/s	11367.86 MB/s	0.90	🔴
FindSequence_Random/medium-4	b9c2c0	6e2b52
	10894.16 MB/s	7140.92 MB/s	0.66	🔴
	94.00 ns/op	143.40 ns/op	1.53	🔴
FindSequence_Random/small-4	b9c2c0	6e2b52
	4713.98 MB/s	3238.19 MB/s	0.69	🔴
	54.31 ns/op	79.06 ns/op	1.46	🔴
GenerateDocs-4	b9c2c0	6e2b52
	935.60 ns/op	1132.00 ns/op	1.21	🔴

[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
FindSequence_Random/medium-4	b9c2c0	432f19
	10894.16 MB/s	9387.04 MB/s	0.86	🔴
	94.00 ns/op	109.10 ns/op	1.16	🔴
GenerateDocs-4	b9c2c0	432f19
	935.60 ns/op	1151.00 ns/op	1.23	🔴

[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
FindSequence_Random/small-4	b9c2c0	601915
	4713.98 MB/s	2396.18 MB/s	0.51	🔴
	54.31 ns/op	106.80 ns/op	1.97	🔴
MutexListAppend-4	b9c2c0	601915
	179.11 MB/s	152.84 MB/s	0.85	🔴
	89328404.00 ns/op	104681779.00 ns/op	1.17	🔴