Initiate work on PutObjectTagging ref PR#71 and issue #72

[johannesboyne]

This fixes issue #72 and builds on PR #71

If the general implementation would work like this as expected, we could extend the test cases a bit and then merge this PR.

[sonarcloud[bot]]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
8.1% Duplication

[codecov-commenter]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (c55a48f) 65.94% compared to head (940f235) 65.74%.

Files	Patch %	Lines
gofakes3.go	56.25%	7 Missing and 7 partials :warning:
routing.go	69.23%	4 Missing :warning:
backend/s3afero/single.go	33.33%	2 Missing :warning:
backend/s3afero/multi.go	66.66%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #75 +/- ## ========================================== - Coverage 65.94% 65.74% -0.21% ========================================== Files 28 28 Lines 2693 2744 +51 ========================================== + Hits 1776 1804 +28 - Misses 651 666 +15 - Partials 266 274 +8 ```

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[johannesboyne]

@elgohr see this implementation as a first step, your test case is running with this but might be good to check out your real-world case against this to see, whether it actually works and behaves as expected.

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
6.9% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud