feat: Add go-retryablehttp

[sbecker59]

Change of solution for the management of rate limiting

• Adding internal/go-retryablehttp based on hashicorp/go-retryablehttp
• Removed time.Sleep which allowed to avoid statuscode 420 returns during testing
• Removed golang.org/x/time/rate which allowed to time out requests

Change of solution for the management error

• Support for Diagnostics

[codecov]

Codecov Report

Merging #52 (ed52b15) into main (0d13371) will decrease coverage by 2.11%.
The diff coverage is 77.04%.

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   84.42%   82.31%   -2.12%     
==========================================
  Files          11       14       +3     
  Lines         764     1238     +474     
==========================================
+ Hits          645     1019     +374     
- Misses         77      156      +79     
- Partials       42       63      +21     

Impacted Files	Coverage Δ
statuspage/data_source_component_groups.go	90.62% <0.00%> (-0.15%)	⬇️
statuspage/helpers.go	100.00% <ø> (ø)
statuspage/resource_component_group.go	87.73% <0.00%> (-0.45%)	⬇️
statuspage/resource_metric_provider.go	78.94% <0.00%> (+0.13%)	⬆️
statuspage/resource_subsriber.go	79.66% <0.00%> (-0.99%)	⬇️
statuspage/provider.go	89.83% <50.00%> (-1.55%)	⬇️
statuspage/internal/hashcode/hashcode.go	66.66% <66.66%> (ø)
statuspage/internal/go-retryablehttp/client.go	71.05% <71.05%> (ø)
statuspage/resource_component.go	86.95% <76.47%> (+0.49%)	⬆️
...atuspage/internal/go-retryablehttp/roundtripper.go	80.00% <80.00%> (ø)
... and 5 more

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