add observatory support

[broswen]

Description

Add support for Cloudflare Observatory endpoints.

Has your change been tested?

Unit test have been created matching the API endpoints spec.

Screenshots (if appropriate):

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 in cloudflare/api-schemas
  and relies on stable APIs.
  • public API documentation coming soon.

[github-actions]

changelog detected ✅

[jacobbednarz]

awesome start. just a few style/convention nitpicks but looking very close!

[codecov-commenter]

Codecov Report

Merging #1401 (307ddb4) into master (b9ac804) will increase coverage by 0.03%.
Report is 279 commits behind head on master.
The diff coverage is 49.74%.

@@            Coverage Diff             @@
##           master    #1401      +/-   ##
==========================================
+ Coverage   48.33%   48.37%   +0.03%     
==========================================
  Files         133      141       +8     
  Lines       13023    13978     +955     
==========================================
+ Hits         6295     6762     +467     
- Misses       5201     5528     +327     
- Partials     1527     1688     +161     

Files Changed	Coverage Δ
access_audit_log.go	79.31% <ø> (ø)
access_bookmark.go	72.44% <ø> (ø)
access_keys.go	71.42% <ø> (ø)
access_organization.go	53.84% <ø> (ø)
access_service_tokens.go	51.85% <ø> (ø)
account_members.go	65.54% <ø> (ø)
account_roles.go	53.84% <ø> (ø)
accounts.go	50.81% <ø> (ø)
addressing_address_map.go	39.04% <ø> (ø)
addressing_ip_prefix.go	45.45% <ø> (ø)
... and 123 more

... and 1 file with indirect coverage changes

[github-actions]

This functionality has been released in v0.78.0.

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