feat(client-s3): use regional endpoint by default and support aws-global region

[AllanZhengYP]

Description of changes:
In S3 client, when using us-east-1 region, then endpoint will be resolved to global endpoint s3.amazonaws.com. This customization makes sure the request is made to regional endpoint s3.us-east-1.amazonaws.com by default. If the endpoint is supplied by user explicitly, SDK won't modify the endpoint to regional.

When using aws-global region explicitly, now S3 will resolve the request to global endpoint s3.amazonaws.com.

This PR is blocked by #1551

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[codecov-io]

Codecov Report

Merging #1552 into master will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1552      +/-   ##
==========================================
+ Coverage   79.84%   80.01%   +0.17%     
==========================================
  Files         304      307       +3     
  Lines       11753    11863     +110     
  Branches     2511     2545      +34     
==========================================
+ Hits         9384     9492     +108     
- Misses       2369     2371       +2     

Impacted Files	Coverage Δ
...dleware-bucket-endpoint/src/bucketHostnameUtils.ts	96.47% <0.00%> (-1.87%)	⬇️
packages/middleware-host-header/src/index.ts	80.00% <0.00%> (ø)
packages/config-resolver/src/EndpointsConfig.ts	100.00% <0.00%> (ø)
packages/middleware-bucket-endpoint/src/index.ts	100.00% <0.00%> (ø)
packages/util-dynamodb/src/convertToNative.ts	100.00% <0.00%> (ø)
...ges/middleware-sdk-s3/src/use-regional-endpoint.ts	86.66% <0.00%> (ø)
packages/util-dynamodb/src/unmarshall.ts	100.00% <0.00%> (ø)
...re-bucket-endpoint/src/bucketEndpointMiddleware.ts	91.89% <0.00%> (+0.22%)	⬆️
...s/middleware-bucket-endpoint/src/bucketHostname.ts	100.00% <0.00%> (+4.34%)	⬆️

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