Reorganize collections

[jialunzhang-psu]

This PR reorganizes containers into a new collections folder. There are two motivations:

• The list of packages in core is getting lengthy.
• After putting different containers into a separate collections folder, it becomes more convenient to share implementation between containers. For example, hashmap and hashset share the same underlying implementation. I split it out to be a separate package (robinhood_hash) and they both become wrappers over it.

What I did:

• Created a new folder collections. Moved relevant packages into it.
• Corrected dependency paths in other packages.
• Create a new robinhood_hash package under collections. Rewrite hashset and hashmap to be just wrappers.

Unresolved issue:

• core/collections/robinhood_hash is a package visible from the outside world. No idea how to make it local to collections.

Note:

• I left vec and list outside of collections, since they are more commonly used.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 47.72727% with 23 lines in your changes are missing coverage. Please review.

Project coverage is 83.83%. Comparing base (ae44a64) to head (68aa713).

Files	Patch %	Lines
collections/hashmap/hashmap.mbt	0.00%	15 Missing :warning:
collections/hashset/hashset.mbt	77.27%	5 Missing :warning:
collections/robinhood_hash/robinhood_hash.mbt	0.00%	2 Missing :warning:
string/string.mbt	66.66%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #324      +/-   ##
==========================================
- Coverage   84.55%   83.83%   -0.72%     
==========================================
  Files          73       74       +1     
  Lines        2874     2845      -29     
==========================================
- Hits         2430     2385      -45     
- Misses        444      460      +16     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[bobzhang]

The orgnanization layout is mostly settled, thanks for your contributions