refactor: move wal crate to under src folder #1270
Merged
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Rationale
Part of #1231.
This change itself is self-contained to merge (i.e., not half-complelted). Since that I may not have enough time to continue the next few days, I post this first for a merge to avoid code conflict.
Detailed Changes
See the commit message.
Test Plan
Refactor. Should pass all existing tests.