flesh out testing - #50

[jGaboardi]

This PR:

• begins the streaming & fleshing out of the testing suite.
• retains the pre v0.1.0 testing suite for the time being.
• starts adding easily verifiable basic versions of tests, along with intermediate and complex ones
• renames the test/* directory to tests/*
• adds a conftest.py and moves several helpers in there
• removes the all_close() testing helper for the numpy one
• resolves #50
• resolves #51
• resolves #54
• xref #20
• xref #60

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.0%. Comparing base (a46603a) to head (a30d9f5). Report is 1 commits behind head on main.

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Additional details and impacted files

[](https://app.codecov.io/gh/carsonfarmer/fastpair/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Carson+Farmer) ```diff @@ Coverage Diff @@ ## main #61 +/- ## ======================================== + Coverage 99.2% 100.0% +0.8% ======================================== Files 2 2 Lines 125 125 ======================================== + Hits 124 125 +1 + Misses 1 0 -1 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/carsonfarmer/fastpair/pull/61/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Carson+Farmer)