feat: implement curp wal storage

[bsbds]

Depends-On: #740

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?)

  This is part of the wal implementation, which implements the WAL storage type

• 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

[mergify[bot]]

@bsbds Convert your pr to draft since CI failed

[mergify[bot]]

@bsbds Convert your pr to draft since CI failed

[mergify[bot]]

@bsbds Convert your pr to draft since CI failed

[mergify[bot]]

@bsbds Convert your pr to draft since CI failed

[mergify[bot]]

@bsbds Convert your pr to draft since CI failed

[Phoenix500526]

@Mergifyio rebase

[mergify[bot]]

rebase

✅ Branch has been successfully rebased

[mergify[bot]]

@bsbds Your PR is in conflict and cannot be merged.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.45977% with 68 lines in your changes missing coverage. Please review.

Project coverage is 75.73%. Comparing base (e35b35a) to head (c92ec80). Report is 132 commits behind head on master.

Files	Patch %	Lines
crates/curp/src/server/storage/wal/mod.rs	73.41%	20 Missing and 22 partials :warning:
crates/curp/src/server/storage/wal/test_util.rs	71.42%	16 Missing :warning:
crates/curp/src/server/storage/wal/error.rs	0.00%	6 Missing :warning:
crates/curp/src/server/storage/wal/tests.rs	97.39%	3 Missing :warning:
crates/curp/src/server/storage/wal/config.rs	92.30%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #687 +/- ## ========================================== + Coverage 75.55% 75.73% +0.17% ========================================== Files 180 192 +12 Lines 26938 28121 +1183 Branches 26938 28121 +1183 ========================================== + Hits 20353 21297 +944 - Misses 5366 5506 +140 - Partials 1219 1318 +99 ```

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