[giga] abstract occ scheduler into interfaces

[codchen]

Describe your changes and provide context

The existing OCC scheduler is somewhat coupled with Cosmos specific logics like sdk.Context and stores. This PR refactors the scheduler to be generic and not dependent on any Cosmos specific types, so that it can later be used for giga execution. Specifically this PR yields the following two interfaces for giga to implement and use:

type Scheduler[Response any]
type SchedulerTask[Response any]

Testing performed to validate your change

refactor - existing tests should still hold

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Dec 16, 2025, 5:19 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.35%. Comparing base (9daec0f) to head (1c987dd).
⚠️ Report is 121 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2610      +/-   ##
==========================================
+ Coverage   43.23%   48.35%   +5.11%     
==========================================
  Files        1851      682    -1169     
  Lines      152771    59854   -92917     
==========================================
- Hits        66055    28943   -37112     
+ Misses      80835    28499   -52336     
+ Partials     5881     2412    -3469     

Flag	Coverage Δ
sei-chain	?
sei-cosmos	?
sei-db	69.06% <ø> (ø)
sei-ibc-go	55.96% <ø> (ø)
sei-tendermint	47.49% <ø> (-0.01%)	⬇️
sei-wasmd	42.10% <ø> (ø)
sei-wasmvm	39.88% <ø> (ø)

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see 1188 files with indirect coverage changes

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[github-actions]

We truly appreciate your contribution and the time you’ve invested in this PR.
Before we can merge it, we’d love your help addressing the remaining feedback or sharing your perspective.
If we don’t hear back within 2 day(s), this PR will close automatically — but don’t worry, you can reopen it anytime when you’re ready to continue.