avoid taking snapshot upon StateDB creation

[codchen]

Describe your changes and provide context

We used to take a Snapshot of the store whenever an EVM transaction starts, even if it's just a value transfer, because we need the original context to serve GetCommittedState. Taking snapshot is expensive from an allocation standpoint. This PR adds a new method on cachekv.Store so that for giga, GetCommittedState can invoke the new method instead of having to take a snapshot at the beginning.

Testing performed to validate your change

unit tests

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 2, 2026, 3:02 AM

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 30, 2026, 4:39 AM

[codecov]

Codecov Report

❌ Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.09%. Comparing base (54a1a21) to head (e7378f8).

Files with missing lines	Patch %	Lines
giga/deps/xevm/state/statedb.go	33.33%	3 Missing and 1 partial ⚠️
giga/deps/xevm/state/state.go	33.33%	1 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (54a1a21) and HEAD (e7378f8). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (54a1a21)	HEAD (e7378f8)
sei-tendermint	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2787      +/-   ##
==========================================
- Coverage   56.69%   47.09%   -9.61%     
==========================================
  Files        2014     1946      -68     
  Lines      165422   159762    -5660     
==========================================
- Hits        93791    75244   -18547     
- Misses      63417    77999   +14582     
+ Partials     8214     6519    -1695     

Flag	Coverage Δ
sei-chain	41.65% <73.91%> (+0.01%)	⬆️
sei-cosmos	48.12% <ø> (ø)
sei-db	68.72% <ø> (ø)
sei-tendermint	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
giga/deps/store/cachekv.go	80.80% <100.00%> (+1.02%)	⬆️
giga/deps/xevm/keeper/keeper.go	58.40% <100.00%> (+0.37%)	⬆️
giga/deps/xevm/keeper/state.go	69.23% <100.00%> (+11.33%)	⬆️
giga/deps/xevm/state/state.go	95.12% <33.33%> (-1.58%)	⬇️
giga/deps/xevm/state/statedb.go	40.78% <33.33%> (+0.52%)	⬆️

... and 319 files with indirect coverage changes

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