feat: add secrets support for tap and target config, via Property(..., secret=True)

[aaronsteers]

Changes:

• Implement writeOnly=True support for passwords and other secrets, as per the JSON Schema spec.
• Additionally implement a secret=True annotation to help with readability for humans.
• The Property type helper class now now implements both of the above via a secret=True argument in the constructor.
• The same type helpers may be used within schema declarations for streams.

Todo:

• Docs for tap config
• [ ] Docs for stream schema creation

Note:

• This also includes general unit testing and type helper improvements, as it was initially developed as part of feat: enable Taps and Targets to generate their own Meltano yaml files #1094.

[codecov]

Codecov Report

Merging #1096 (8eb0026) into main (6563a47) will decrease coverage by 0.18%.
The diff coverage is 60.97%.

@@            Coverage Diff             @@
##             main    #1096      +/-   ##
==========================================
- Coverage   83.60%   83.41%   -0.19%     
==========================================
  Files          40       40              
  Lines        3805     3840      +35     
  Branches      640      655      +15     
==========================================
+ Hits         3181     3203      +22     
- Misses        464      472       +8     
- Partials      160      165       +5     

Impacted Files	Coverage Δ
singer_sdk/helpers/_typing.py	50.31% <50.00%> (+2.24%)	⬆️
singer_sdk/plugin_base.py	75.14% <100.00%> (ø)
singer_sdk/sinks/core.py	80.64% <100.00%> (ø)
singer_sdk/typing.py	94.56% <100.00%> (+0.09%)	⬆️

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[edgarrmondragon]

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