Springboot based implementation of AFS backend

[sylvlecl]

Please check if the PR fulfills these requirements (please use '[x]' to check the checkboxes, or submit the PR and then click the checkboxes)

• [X] The commit message follows our guidelines
• [X] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem ? If so, link to this issue using '#XXX' and skip the rest

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

What is the current behavior? (You can also link to an open issue here)

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change or deprecate an API? If yes, check the following:

• [ ] The Breaking Change or Deprecated label has been added
• [ ] The migration guide has been updated in the github wiki (What changes might users need to make in their application due to this PR?)

Other information:

[sonarcloud[bot]]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities
0 Security Hotspots
5 Code Smells

72.9% Coverage
1.5% Duplication

The version of Java (1.8.0_275) you have used to run this analysis is deprecated and we will stop accepting it soon. Please update to at least Java 11. Read more here

[sylvlecl]

@pl-buiquang @PratheepDev @jonenst : Just added 2 commits, following issues encountered in production:

• bump spring version
• replace use of InputStreamResource by StreamingResponseBody for returning blobs. The original motivation was to fix an issue, but I think it's interesting to keep this streaming behaviour

[jonenst]

Overall very clean code, I like it, good job

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
7 Code Smells

82.6% Coverage
1.9% Duplication