feat: Support requests.auth authenticators

[edgarrmondragon]

Closes #1105

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📚 Documentation preview 📚: https://meltano-sdk--1109.org.readthedocs.build/en/1109/

[codecov]

Codecov Report

Merging #1109 (c6caacc) into main (7ec2a71) will increase coverage by 0.06%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             main    #1109      +/-   ##
==========================================
+ Coverage   85.12%   85.19%   +0.06%     
==========================================
  Files          54       54              
  Lines        4694     4708      +14     
  Branches      798      800       +2     
==========================================
+ Hits         3996     4011      +15     
+ Misses        507      506       -1     
  Partials      191      191              

Impacted Files	Coverage Δ
singer_sdk/authenticators.py	65.76% <92.30%> (+1.59%)	⬆️
singer_sdk/streams/rest.py	86.41% <100.00%> (+1.51%)	⬆️

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[aaronsteers]

@edgarrmondragon - This one went under my radar and I'm just reading through now. Can you add a usage example in one of the sample implementations, or in the Code Samples section, or similar? I'm not super familiar with this and I think a sample usage would be helpful also for devs who want to leverage this.

Or is it proper to think of this as fully internal to the SDK and the dev-side experience is basically the same?

[edgarrmondragon]

@edgarrmondragon - This one went under my radar and I'm just reading through now. Can you add a usage example in one of the sample implementations, or in the Code Samples section, or similar? I'm not super familiar with this and I think a sample usage would be helpful also for devs who want to leverage this.

Or is it proper to think of this as fully internal to the SDK and the dev-side experience is basically the same?

@aaronsteers thanks for taking a look! I've added a simple example with links to community-supported authentication classes:

https://meltano-sdk--1109.org.readthedocs.build/en/1109/code_samples.html#use-one-of-requests-s-built-in-authenticators

[aaronsteers]

@edgarrmondragon - Super helpful!! Thank you!

I was going to ask for links and then realized they are already linked 😅.

LGTM!

[aaronsteers]

Feel free to merge when ready. 🚀