Add support for listing R2 buckets

[rgcostea]

Description

Added the ability to list R2 buckets. A recent change (#1028) added support for creating and deleting R2 buckets but was missing the ability to list R2 buckets. This change adds support for listing R2 buckets.

Has your change been tested?

Enhanced r2_bucket_test.go with an additional test (TestR2_ListBuckets) to list R2 buckets. Also verified this against an active cloudflare account.

Types of changes

What sort of change does your code introduce/modify?

• New feature (non-breaking change which adds functionality)

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.

[github-actions]

changelog detected ✅

[codecov-commenter]

Codecov Report

Merging #1063 (9387c77) into master (e39278e) will increase coverage by 0.14%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #1063      +/-   ##
==========================================
+ Coverage   49.94%   50.09%   +0.14%     
==========================================
  Files         115      121       +6     
  Lines       10991    11737     +746     
==========================================
+ Hits         5490     5880     +390     
- Misses       4338     4571     +233     
- Partials     1163     1286     +123     

Impacted Files	Coverage Δ
teams_accounts.go	53.84% <ø> (ø)
r2_bucket.go	75.67% <52.63%> (-24.33%)	⬇️
api_shield.go	53.84% <53.84%> (ø)
workers.go	69.38% <66.66%> (-0.04%)	⬇️
cloudflare.go	68.71% <100.00%> (+1.50%)	⬆️
email_routing_settings.go	60.00% <100.00%> (ø)
images.go	50.34% <100.00%> (-0.35%)	⬇️
split_tunnel.go	40.38% <0.00%> (-13.47%)	⬇️
teams_list.go	52.72% <0.00%> (-7.61%)	⬇️
access_service_tokens.go	64.70% <0.00%> (-3.72%)	⬇️
... and 46 more

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[Cyb3r-Jak3]

@jacobbednarz This seems to have landed https://api.cloudflare.com/#r2-bucket-list-buckets. It does support pagination with cursors

[jacobbednarz]

thanks @Cyb3r-Jak3 . bumped the method signature too to get the customisations into it.

[github-actions]

This functionality has been released in v0.55.0.

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