refactor(storage): make HummockVersion a generic struct

[zwang28]

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What's changed and what's your intention?

The in-memory HummockVersion struct has many interdependent sub types, e.g. Levels, EpochNewChangeLog, etc.
There're cases we want a similar HummockVersion struct but with only the SstableInfo replaced. For instance, storing either SstableId or Arc<SstableInfo> instead of SstableInfo can significantly reduce the memory footprint.

This pull request introduces a generic parameter to HummockVersion, allowing the use of SstableInfo to be replaced with a more flexible type. All original types XX are made generic and renamed to XXCommon<T>.

Current there're two concrete types:

• HummockVersionCommon<SstableInfo>, alias HummockVersion;
• HummockVersionCommon<SstableIdInVersion>, which is used by time travel.

To introduce a new type, just implement From trait. Check out time_travel.rs for example.

Checklist

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[hzxa21]

LGTM

[hzxa21]

Conversion between PbSstableInfo and SstableIdInVersion is lossy. We should make sure it will not be misused.