feat(middleware-bucket-endpoint): generate endpoint from Access Point ARN

[AllanZhengYP]

Description of changes:
With this change, users can supply a valid Access Point ARN to the Bucket parameter in S3 operations. SDK will make request to an Access Point endpoint instead of the normal bucket endpoint.

Users can also call the bucketHostname() directly without S3 client to generate the request hostname from the given input.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@c18bfe4). Click here to learn what that means.
The diff coverage is 97.43%.

@@            Coverage Diff            @@
##             master    #1441   +/-   ##
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  Coverage          ?   79.79%           
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  Files             ?      300           
  Lines             ?    11478           
  Branches          ?     2466           
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  Hits              ?     9159           
  Misses            ?     2319           
  Partials          ?        0           

Impacted Files	Coverage Δ
...s/middleware-bucket-endpoint/src/bucketHostname.ts	95.65% <94.73%> (ø)
...dleware-bucket-endpoint/src/bucketHostnameUtils.ts	98.33% <98.33%> (ø)
...re-bucket-endpoint/src/bucketEndpointMiddleware.ts	91.66% <100.00%> (ø)
...s/middleware-bucket-endpoint/src/configurations.ts	100.00% <100.00%> (ø)
...er-cognito-identity/src/fromCognitoIdentityPool.ts	100.00% <0.00%> (ø)
...ges/eventstream-marshaller/src/HeaderMarshaller.ts	100.00% <0.00%> (ø)
packages/middleware-stack/src/MiddlewareStack.ts	98.38% <0.00%> (ø)
...tests/aws-restxml/commands/XmlAttributesCommand.ts	100.00% <0.00%> (ø)
...ests/aws-restxml/commands/XmlMapsXmlNameCommand.ts	100.00% <0.00%> (ø)
packages/url-parser-browser/src/index.ts	100.00% <0.00%> (ø)
... and 294 more

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[trivikr]

Overall LGTM, some minor comments and nits

[github-actions]

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