Extend memory tier configs to cache allocator based on NUMA bindings

[byrnedj]

This PR is to add support for NUMA bindings to the memory tier config that was upstreamed in https://github.com/facebook/CacheLib/pull/138

A quick summary of the PR is:

• Add memory tier configs to cache allocator based on NUMA bindings
• Add in MemoryTier tests
• Add getPoolSize() and inline the calculate tier size for tests
• Increase max number of tiers to 2 for tiers tests

[facebook-github-bot]

@therealgymmy has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@therealgymmy merged this pull request in facebook/CacheLib@b43ae59756225f915b5018a1fef6c71c61f7efc5.