Extract kover configurations into a build-logic plugin

[nashcft]

Issue

• close #761

Overview (Required)

Extracted kover configurations for each projects into a plugin like kotlinx.coroutines' convention plugin so that, when we add a new module, we don't have to care about applying kover plugin to it and adding kover declaration to report-aggregator module.

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Screenshot (Optional if screenshot test is present or unrelated to UI)

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Movie (Optional)

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[github-actions[bot]]

Test Results

211 tests   211 :heavy_check_mark:  6m 26s :stopwatch:   11 suites      0 :zzz:   11 files        0 :x:

Results for commit f35f2996.

:recycle: This comment has been updated with latest results.

[takahirom]

Can you fix the conflict? 🙏

[nashcft]

Thanks for the review 🙏

Project Isolation

I've read that document and I understand this change will affect project isolation feature in current stage. But the feature is still in experimental, so I also think it should be OK that we use plugins or configurations like this for now 👍