feat: automatically retry rate-limited requests

[angeloashmore]

Types of changes

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

Description

This PR adds automatic retry support when Prismic Rest API V2 returns a "429: Too many requests" error response.

The 429 error response can be returned if the API rate limit is exceeded. As of this PR, the API has a limit of 200 requests per second.

@prismicio/client will automatically retry those requests after enough time has ellapsed to avoid the rate limit. The retry will be transparent from client code, except for the extra wait time.

Code using @prismicio/client does not need to change to take advantage of the automatic retry feature.

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

🦔

[codecov-commenter]

Codecov Report

Merging #319 (e7ed465) into master (af6a593) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master     #319   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          50       50           
  Lines        6049     6087   +38     
  Branches      294      301    +7     
=======================================
+ Hits         6047     6085   +38     
  Misses          2        2           

Files Changed	Coverage Δ
src/createClient.ts	100.00% <100.00%> (ø)

[lihbr]

LGTM!