Export functions

[mmaelicke]

The export functions need to be added to the API.

• [x] add a default export extension
• [ ] find group and find entry needs a export flag.
• [ ] The API should use the Entry interface to potentially export to any format defined in the extension
• [x] add a test to cover the exports. Should use a composite entry and check if a file was created

[codecov[bot]]

Codecov Report

Merging #132 (0f64cc8) into master (c0b539b) will increase coverage by 1.12%. The diff coverage is 60.69%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   58.63%   59.76%   +1.12%     
==========================================
  Files          59       65       +6     
  Lines        2715     3007     +292     
==========================================
+ Hits         1592     1797     +205     
- Misses       1123     1210      +87     

Flag	Coverage Δ
e2e	59.76% <60.69%> (+1.12%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
metacatalog/cmd/__init__.py	100.00% <ø> (ø)
metacatalog/db/revisions/__init__.py	100.00% <ø> (ø)
metacatalog/models/details.py	97.77% <ø> (ø)
metacatalog/models/timeseries_legacy.py	0.00% <0.00%> (ø)
metacatalog/cmd/find.py	40.90% <6.66%> (-10.08%)	:arrow_down:
metacatalog/ext/__init__.py	48.93% <8.33%> (-5.35%)	:arrow_down:
metacatalog/cmd/rest.py	50.00% <50.00%> (ø)
metacatalog/ext/export/extension.py	56.00% <56.00%> (ø)
metacatalog/db/revisions/rev6.py	60.00% <60.00%> (ø)
metacatalog/models/datasource.py	54.80% <60.00%> (-0.10%)	:arrow_down:
... and 29 more

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