Make synced collection a hidden package

[kidrahahjo]

Description

Make synced collection package hidden.

Motivation and Context

Resolves #790

Checklist:

• [x] I am familiar with the Contributing Guidelines.
• [x] I agree with the terms of the Contributor Agreement.
• [x] My name is on the list of contributors.
• [x] The changes introduced by this pull request are covered by existing or newly introduced tests.
• [ ] The package documentation and framework documentation in signac-docs are up to date with these changes.
• [x] I have updated the changelog and added any related issue and pull request numbers for future reference.

[codecov[bot]]

Codecov Report

Merging #807 (0279ce0) into next (52ff017) will decrease coverage by 1.31%. The diff coverage is 78.85%.

@@            Coverage Diff             @@
##             next     #807      +/-   ##
==========================================
- Coverage   86.32%   85.00%   -1.32%     
==========================================
  Files          51       54       +3     
  Lines        4687     4675      -12     
  Branches     1022     1011      -11     
==========================================
- Hits         4046     3974      -72     
- Misses        456      522      +66     
+ Partials      185      179       -6     

Impacted Files	Coverage Δ
signac/_synced_collections/__init__.py	100.00% <ø> (ø)
signac/_synced_collections/_caching.py	0.00% <0.00%> (ø)
signac/_synced_collections/backends/__init__.py	100.00% <ø> (ø)
..._synced_collections/backends/collection_mongodb.py	90.90% <ø> (ø)
...c/_synced_collections/backends/collection_redis.py	65.62% <ø> (ø)
...ac/_synced_collections/backends/collection_zarr.py	88.00% <ø> (ø)
signac/_synced_collections/buffers/__init__.py	100.00% <ø> (ø)
..._collections/buffers/memory_buffered_collection.py	100.00% <ø> (ø)
signac/_synced_collections/data_types/__init__.py	100.00% <ø> (ø)
signac/_synced_collections/data_types/attr_dict.py	100.00% <ø> (ø)
... and 60 more

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[vyasr]

@bdice @kidrahahjo I've standardized the docs in a relatively simple way. Let me know what you two think. In the interest of getting 2.0 done. I think we shouldn't belabor the documentation question too much further for now; we can revisit in 2.x, especially once synced_collections is actually a separate, accessible package, but I don't want to block 2.0 over that discussion.