refactor: remove keys from command

[bsbds]

The keys are not necessary in serialization, we could generate keys only when being used.

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)

• what changes does this pull request make?

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)

[mergify[bot]]

@bsbds Convert your pr to draft since CI failed

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.36364% with 4 lines in your changes missing coverage. Please review.

Project coverage is 75.65%. Comparing base (e35b35a) to head (d99d45a). Report is 123 commits behind head on master.

Files	Patch %	Lines
crates/xline/src/server/kv_server.rs	50.00%	2 Missing :warning:
crates/xline/src/server/lock_server.rs	0.00%	1 Missing :warning:
crates/xline/src/storage/compact/mod.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #852 +/- ## ========================================== + Coverage 75.55% 75.65% +0.09% ========================================== Files 180 187 +7 Lines 26938 27767 +829 Branches 26938 27767 +829 ========================================== + Hits 20353 21006 +653 - Misses 5366 5469 +103 - Partials 1219 1292 +73 ```

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