Support local-to-remote mirroring

[minwoox]

Motivation We currently support only remote-to-local mirroring. We should support the opposite direction as well.

Modifications:

• Implement GitMirror#mirrorToLocalRemote() which used to throw UnsupportedOperationException before.

Result:

• Close #53
• You can now enable mirroring from Central Dogma to a remote Git server.

[codecov[bot]]

Codecov Report

Base: 64.95% // Head: 65.11% // Increases project coverage by +0.15% :tada:

Coverage data is based on head (52187d1) compared to base (0cf990c). Patch coverage: 79.46% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #717      +/-   ##
============================================
+ Coverage     64.95%   65.11%   +0.15%     
- Complexity     3227     3259      +32     
============================================
  Files           349      349              
  Lines         13474    13670     +196     
  Branches       1454     1485      +31     
============================================
+ Hits           8752     8901     +149     
- Misses         3896     3928      +32     
- Partials        826      841      +15     

Impacted Files	Coverage Δ
...erver/internal/mirror/DefaultMirroringService.java	65.90% <0.00%> (ø)
...ntraldogma/server/internal/mirror/MirrorState.java	100.00% <ø> (ø)
...inecorp/centraldogma/server/mirror/MirrorUtil.java	76.47% <ø> (ø)
...centraldogma/server/internal/mirror/GitMirror.java	79.09% <80.00%> (-0.17%)	:arrow_down:
...necorp/centraldogma/testing/internal/TestUtil.java	83.33% <100.00%> (+1.51%)	:arrow_up:
...aldogma/client/armeria/CompositeEndpointGroup.java	75.00% <0.00%> (-18.75%)	:arrow_down:
...centraldogma/server/internal/api/WatchService.java	76.27% <0.00%> (-3.39%)	:arrow_down:
.../linecorp/centraldogma/client/AbstractWatcher.java	76.00% <0.00%> (-2.67%)	:arrow_down:
...ntraldogma/server/internal/mirror/GitWithAuth.java	31.25% <0.00%> (+0.89%)	:arrow_up:
... and 1 more

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[minwoox]

@ikhoon Addressed all the comments. 😉

[ikhoon]

The master branch is merged into the working branch to run in Apple Silicon.

[minwoox]

Thanks, @ikhoon and @jrhee17 for reviewing. 😉