Add tiles_info endpoint

[dmannarino]

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Pull request type

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• Bugfix
• Feature
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• Refactoring (no functional changes, no api changes)
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• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

• There is now a /assets/{asset_id}/tiles_info endpoint for raster tile set assets, which gives a redirect to the tiles.geojson file in S3.

Does this introduce a breaking change?

• Yes
• No

Other information

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 81.61%. Comparing base (3cb83d7) to head (eef8d90).

Files	Patch %	Lines
app/routes/assets/asset.py	41.66%	7 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #526      +/-   ##
===========================================
- Coverage    81.70%   81.61%   -0.10%     
===========================================
  Files          125      125              
  Lines         5615     5624       +9     
===========================================
+ Hits          4588     4590       +2     
- Misses        1027     1034       +7     

Flag	Coverage Δ
unittests	81.61% <41.66%> (-0.10%)	⬇️

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[dmannarino]

Merged as hotfix instead.