Samples: Use Datamanagment API to initiate file transfer

[cpeeyush]

What this PR changes/adds

• Updated samples to work with DataManagement API to initiate file transfer.
• Removed existing custom implementation of ConsumerApiController.
• Updated docs.

Why it does that

To use DataManagement API.

Further notes

Follow PR of #221

Linked Issue(s)

Closes #228

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• added relevant details to the changelog? (skip with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

[github-actions]

Unit Test Results

     355 files  ±0       355 suites  ±0   3m 54s ⏱️ -46s
11 950 tests ±0  11 936 ✔️ ±0  14 💤 ±0  0 ❌ ±0 
12 011 runs  ±0  11 997 ✔️ ±0  14 💤 ±0  0 ❌ ±0 

Results for commit b66ac8c. ± Comparison against base commit 6ca6ffe.

♻️ This comment has been updated with latest results.

[marcgs]

Suggesting to add the changes in this commit: 8a1ac4b. This enhances the README with instructions how to perform file transfers and shows screenshots of the traces for contract negotiations and file transfers.

Note: eclipse-edc#1162 is required for traces in DPF

[codecov-commenter]

Codecov Report

Merging #227 (8a1ac4b) into feature/1120-update-samples-use-data-management-api (6ca6ffe) will decrease coverage by 0.00%.
The diff coverage is 68.05%.

❗ Current head 8a1ac4b differs from pull request most recent head b66ac8c. Consider uploading reports for the commit b66ac8c to get more accurate results

@@                                    Coverage Diff                                    @@
##             feature/1120-update-samples-use-data-management-api     #227      +/-   ##
=========================================================================================
- Coverage                                                  62.63%   62.63%   -0.01%     
- Complexity                                                  2973     2984      +11     
=========================================================================================
  Files                                                        694      695       +1     
  Lines                                                      15420    15464      +44     
  Branches                                                    1043     1048       +5     
=========================================================================================
+ Hits                                                        9659     9686      +27     
- Misses                                                      5332     5347      +15     
- Partials                                                     429      431       +2     

Impacted Files	Coverage Δ
...core/transfer/TransferProcessSendRetryManager.java	89.47% <ø> (ø)
...r/api/exception/mappers/EdcApiExceptionMapper.java	100.00% <ø> (ø)
...tamanagement/policy/service/PolicyServiceImpl.java	87.09% <ø> (ø)
...nnector/aws/dataplane/s3/DataPlaneS3Extension.java	100.00% <ø> (ø)
...ataspaceconnector/aws/dataplane/s3/S3DataSink.java	38.46% <ø> (ø)
...econnector/aws/dataplane/s3/S3DataSinkFactory.java	100.00% <ø> (ø)
...aspaceconnector/aws/dataplane/s3/S3DataSource.java	50.00% <ø> (ø)
...onnector/aws/dataplane/s3/S3DataSourceFactory.java	100.00% <ø> (ø)
...taplane/s3/validation/CompositeValidationRule.java	100.00% <ø> (ø)
...aplane/s3/validation/EmptyValueValidationRule.java	100.00% <ø> (ø)
... and 17 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6ca6ffe...b66ac8c. Read the comment docs.

[marcgs]

see inline comment

[cpeeyush]

Suggesting to add the changes in this commit: 8a1ac4b. This enhances the README with instructions how to perform file transfers and shows screenshots of the traces for contract negotiations and file transfers.

Note: eclipse-dataspaceconnector#1162 is required for traces in DPF

@marcgs As discussed picked up changes from commit 8a1ac4b into this PR. Please take a look.