Provide initial implementation for AWS - not complete

[t2gran]

Summary

Hi, her is a skeleton implementation for Amazon AWS S3 support - It need more work, especially on the S3 integration part , but it is a good start - in particular if you do not know OTP that well. It may serve as a template for implementing support for other storage providers as well.

I am not going to complete this PR - feel free to cherry-pick my initial commit and complete the work.

Unit tests

Test needs to be added.

Documentation

Documentation needs to be added.

Changelog

This should be in the changelog - if ever merged.

[codecov-commenter]

Codecov Report

Merging #4391 (13f6df4) into dev-2.x (37bd51e) will decrease coverage by 0.14%.
The diff coverage is 2.87%.

@@              Coverage Diff              @@
##             dev-2.x    #4391      +/-   ##
=============================================
- Coverage      58.05%   57.91%   -0.15%     
- Complexity     11028    11030       +2     
=============================================
  Files           1454     1462       +8     
  Lines          58677    58827     +150     
  Branches        6750     6759       +9     
=============================================
+ Hits           34063    34067       +4     
- Misses         22585    22729     +144     
- Partials        2029     2031       +2     

Impacted Files	Coverage Δ
...anner/ext/datastore/aws/AbstractAwsDataSource.java	0.00% <0.00%> (ø)
...planner/ext/datastore/aws/AwsDataSourceModule.java	0.00% <0.00%> (ø)
...ner/ext/datastore/aws/AwsDataSourceRepository.java	0.00% <0.00%> (ø)
...nner/ext/datastore/aws/AwsDirectoryDataSource.java	0.00% <0.00%> (ø)
...ipplanner/ext/datastore/aws/AwsFileDataSource.java	0.00% <0.00%> (ø)
...lanner/ext/datastore/aws/AwsOutFileDataSource.java	0.00% <0.00%> (ø)
...tripplanner/ext/datastore/aws/AwsOutputStream.java	0.00% <0.00%> (ø)
...rg/opentripplanner/ext/datastore/aws/S3Object.java	0.00% <0.00%> (ø)
...ipplanner/datastore/configure/DataStoreModule.java	68.75% <0.00%> (-9.83%)	⬇️
...entripplanner/standalone/config/StorageConfig.java	91.42% <50.00%> (-5.35%)	⬇️
... and 11 more

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