OT Commissioner enhancements

[mikhail-pridushchenko]

This PR adds changes on multi-network syntax and import/export syntax support for the commissioner application.

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[codecov-commenter]

Codecov Report

Merging #202 (b1f23f6) into main (5bf54fa) will increase coverage by 9.94%. The diff coverage is 81.34%.

:exclamation: Current head b1f23f6 differs from pull request most recent head dbf21aa. Consider uploading reports for the commit dbf21aa to get more accurate results

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
+ Coverage   68.90%   78.85%   +9.94%     
==========================================
Files          55       75      +20     
Lines        4937     9152    +4215     
==========================================
+ Hits         3402     7217    +3815     
- Misses       1535     1935     +400     

Impacted Files	Coverage Δ
include/commissioner/commissioner.hpp	40.00% <ø> (-3.75%)	:arrow_down:
src/app/border_agent.cpp	89.47% <ø> (+7.51%)	:arrow_up:
src/app/json.hpp	0.00% <ø> (ø)
src/common/utils.hpp	100.00% <ø> (ø)
src/ut/app/commissioner_app_replace.cpp	0.00% <0.00%> (ø)
src/ut/app/test_interpreter.cpp	99.59% <ø> (ø)
src/app/commissioner_app.cpp	32.97% <12.50%> (-6.97%)	:arrow_down:
src/library/commissioner_impl.cpp	74.64% <20.00%> (-1.72%)	:arrow_down:
src/ut/app/commissioner_app_mock.hpp	56.16% <56.16%> (ø)
src/app/ps/persistent_storage_json.cpp	62.45% <62.45%> (ø)
... and 72 more

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[mikhail-pridushchenko]

@googlebot I fixed it.

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[mikhail-pridushchenko]

@googlebot I fixed it.

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[mikhail-pridushchenko]

@googlebot I fixed it.

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[mikhail-pridushchenko]

@googlebot I fixed it.

[google-cla[bot]]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google. In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

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[mikhail-pridushchenko]

@googlebot I fixed it.