Add api shield configuration GET/PUT

[jafowler]

Description

This PR adds support for API shield configuration GET/PUT requests.
This is needed to help support more products under the Http Applications umbrella.

Has your change been tested?

I wrote some tests for both GET and PUT. Can add more if needed.

Types of changes

What sort of change does your code introduce/modify?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• This change is using publicly documented (api.cloudflare.com or developers.cloudflare.com) and stable APIs.https://api.cloudflare.com/#api-shield-settings-properties

[github-actions]

changelog detected ✅

[codecov-commenter]

Codecov Report

Merging #1059 (9da8f52) into master (e39278e) will increase coverage by 0.00%.
The diff coverage is 53.84%.

@@           Coverage Diff           @@
##           master    #1059   +/-   ##
=======================================
  Coverage   49.94%   49.95%           
=======================================
  Files         115      116    +1     
  Lines       10991    11017   +26     
=======================================
+ Hits         5490     5504   +14     
- Misses       4338     4346    +8     
- Partials     1163     1167    +4     

Impacted Files	Coverage Δ
api_shield.go	53.84% <53.84%> (ø)
r2_bucket.go	100.00% <0.00%> (ø)
teams_accounts.go	53.84% <0.00%> (ø)

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[jafowler]

Just saw https://github.com/cloudflare/cloudflare-go/blob/master/docs/experimental.md, will work to update this to follow the doc.

[jacobbednarz]

thanks @jafowler - looks good!

[jafowler]

Thanks @jacobbednarz for cleaning up the tests, i'll follow that for the next few resources i'll be adding.

[github-actions]

This functionality has been released in v0.49.0.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!