Add the loop time enabler for explicit usage (both as a context manager and decorator)

[nolar]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 20489860546

Details

• 25 of 42 (59.52%) changed or added relevant lines in 2 files are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+1.2%) to 64.204%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
looptime/init.py	0	1	0.0%
looptime/enabler.py	25	41	60.98%

Files with Coverage Reduction	New Missed Lines	%
looptime/plugin.py	5	65.83%

Totals
Change from base Build 20489594623:	1.2%
Covered Lines:	292
Relevant Lines:	483

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💛 - Coveralls