support nif module reload

[qzhuyan]

This PR makes code:purge(quicer_nif) and code:delete(quicer_nif) work properly so that the msquic library could be unloaded from process memory. This is precondition that we could support hot upgrade, unload the old version of code.

There are many changes in test suite to ensure resources are cleaned in each testcase run because it is risky to keep unlean resources running such as calling callbacks with dangling pointer. To prevent that the call to the unload module will wait forever until all resources (msquic handles) are closed.

I also did some major changes to close the msquic handles much earlier when the msquic handles are safe to be closed.
In the old impl. handles are closed only when deallocating nif resources but now we do it much earlier with the cost of using mutex.

Followups:
[] Ensure all APIs are thread safe since we 'close the handle earlier'.
[] {error, invalid_paramter} could be avoided if we check if NULL before passing the handle to msquic API.
[] release script needs to pick versioned so files and lttng build files as well.

[coveralls]

Pull Request Test Coverage Report for Build 6482531202

• 89 of 105 (84.76%) changed or added relevant lines in 9 files are covered.
• 16 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.1%) to 83.103%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
c_src/quicer_connection.c	20	21	95.24%
c_src/quicer_nif.c	20	21	95.24%
c_src/quicer_reg.c	11	12	91.67%
c_src/quicer_listener.c	8	11	72.73%
c_src/quicer_stream.c	12	17	70.59%
src/quicer_nif.erl	9	14	64.29%

Files with Coverage Reduction	New Missed Lines	%
c_src/quicer_listener.c	1	85.0%
c_src/quicer_stream.c	1	87.5%
src/quicer.erl	1	88.32%
src/quicer_stream.erl	1	72.22%
c_src/quicer_config.c	3	83.55%
c_src/quicer_nif.c	9	76.76%

Totals
Change from base Build 6473541375:	-0.1%
Covered Lines:	3246
Relevant Lines:	3906

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💛 - Coveralls