gCMT Catalog accessor

[pabloitu]

Added gcmt accessor from ISC API. Follows the same logic than comcat and bsi readers. Created test for an event search and summary info from a request.

pyCSEP Pull Request Checklist

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on making pull requests to pyCSEP.

Fixes issue #(please fill in or delete if not needed).

Type of change:

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[pabloitu]

reworked into reading gcmt from IRIS instead of ISC, which takes less time and gives less query issues.

[codecov-commenter]

Codecov Report

Patch coverage: 66.27% and project coverage change: +0.42 🎉

Comparison is base (c19ce9f) 54.63% compared to head (19eaabd) 55.05%.

❗ Current head 19eaabd differs from pull request most recent head 533e2a2. Consider uploading reports for the commit 533e2a2 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
+ Coverage   54.63%   55.05%   +0.42%     
==========================================
  Files          22       23       +1     
  Lines        3904     3954      +50     
  Branches      650      656       +6     
==========================================
+ Hits         2133     2177      +44     
- Misses       1636     1641       +5     
- Partials      135      136       +1     

Impacted Files	Coverage Δ
csep/__init__.py	26.25% <24.13%> (-0.04%)	⬇️
csep/utils/readers.py	46.85% <75.00%> (+0.77%)	⬆️
csep/utils/iris.py	92.68% <92.68%> (ø)

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[pabloitu]

*note: In the tests/build workflow, the conda environment build is taking too long

pycsep/.github/workflows/build-test.yml

Line 32 in c19ce9f

conda env update --file requirements.yml

and sometimes it gives up of building the environment and just fail the workflow. We maybe should build the environment differently.