[Merged by Bors] - feat: Simple lemmas about convergence in WithTop

[kex-y]

---

Some useful lemmas required for #33375

[github-actions]

PR summary f1a5ef6e2c

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

+ tendsto_coe_atTop
+ tendsto_nhds_top_iff

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[j-loreaux]

bors d+

[mathlib-bors]

✌️ kex-y can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

[j-loreaux]

I realized later that my original review didn't check that these lemmas were really necessary, some of them aren't, so I've provided an alternative path here.

[kex-y]

Thanks!
bors r+

[mathlib-bors]

Pull request successfully merged into master.

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