Support size encoding for clock cuckoo filter in shadowcache

[LDawns]

What changes are proposed in this pull request?

Implement the size encoder and integrate it into Alluxio's shadow cache.

Why are the changes needed?

It can save the space cost of the size filed in clock cuckoo filter.

Does this PR introduce any user facing changes?

Add an propertykey : USER_CLIENT_CACHE_SHADOW_CUCKOO_SIZE_ENCODER, it can decide whether to use size encoder or not.

[alluxio-bot]

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[alluxio-bot]

Automated checks report:

• Commits associated with Github account: PASS
• PR title follows the conventions: FAIL
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[alluxio-bot]

Automated checks report:

• Commits associated with Github account: PASS
• PR title follows the conventions: PASS

All checks passed!

[beinan]

alluxio-bot, merge this please.