Add pytest setup for each package

This MR adds consistent pytest configurations across the gstlal packages.

Changes:

• add pytest directory and config file for each package
• add build suite for each package (if not already present)

added 2 commits

• a73bacd7 - 1 commit from branch master
• 730d1d12 - Merge Master

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added 1 commit

• 078c6f8f - remove test output files

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requested review from @patrick.godwin

The gstlal-calibration test issues should hopefully be addressed by !52 (merged).

added 42 commits

• 078c6f8f...0df532c4 - 41 commits from branch master
• 1d3c8fe6 - Merge branch 'master' into feature-you-get-a-pytest

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added 2 commits

• de3316b3 - 1 commit from branch master
• f9c486da - Merge branch 'master' into feature-you-get-a-pytest

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added 2 commits

• 65d09a88 - 1 commit from branch master
• f170ed23 - Merge branch 'master' into feature-you-get-a-pytest

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added 4 commits

• f170ed23...b9f71aa1 - 3 commits from branch master
• 1e46bd14 - Merge branch 'master' into feature-you-get-a-pytest

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added 2 commits

• 41c8b3c6 - 1 commit from branch master
• 927d725c - Merge branch 'master' into feature-you-get-a-pytest

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added 1 commit

• d0f1efb1 - mr feedback

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resolved all threads

Looks good, @james.kennington! Happy to see continued work on the test suite.

approved this merge request

added 2 commits

• 47bb0b88 - 1 commit from branch master
• c458f1ce - Merge branch 'master' into feature-you-get-a-pytest

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enabled an automatic merge when the pipeline for c458f1ce succeeds

merged