Implement WAL static analysis to ensure that new entries will be properly annotated

[serathius]

Part of #13168

cc @hexfusion @ptabor

[ptabor]

I wonder whether we are not parsing these options too frequently (e.g. on each interpreted data enum).
Alternatively we could build a map(s):

• field-> version
• enum -> version
  The way we build the version file... and during the data processing just keep performing lookups in the map.

[serathius]

Sure, we will definitely need this for version API calls as they will be latency sensitive, however I would skip this optimization of static analysis.

[ptabor]

Aren't we afraid that start time of etcd server that will keep processing WAL log (ReadWALVersion) will get significantly slower. Have you tested it with realistic: O(64MB) Wal files ?

[serathius]

We don't verify WAL during server start, we do it during downgrade and after we created a snapshot.

[serathius]

ping @ptabor

[ptabor]

Aren't we afraid that start time of etcd server that will keep processing WAL log (ReadWALVersion) will get significantly slower. Have you tested it with realistic: O(64MB) Wal files ?

[serathius]

@ptabor PTAL

[codecov-commenter]

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[ptabor]

Thank you !