feat(plugins): add support wildcard config for scoped package plugin

[hdmr14]

If you wish load all scoped package plugins by @*/karma-* like karma-*, karma doesn't handle it.
It'll be modified to RegExp("^@.*/karma-*") internally, and karma doesn't care scoped package's sub directories.

In this PR, add features below.

• support plugin name with multiple * (replace ALL * to .*)
  • @*/karma-* is now valid
  • karma-* also work same as before
  • however, if anyone already force using multiple * (such as karma-*-foo-.*), there is a risk of incompatibility
• when finding plugin, get scoped package name now correctly (before: @foo, now: @foo/bar)

Fixes #3656

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[karmarunnerbot]

✅ Build karma 539 completed (commit 632ce319f5 by @hdmr14)

[AppVeyorBot]

✅ Build karma 2936 completed (commit 632ce319f5 by @hdmr14)

[karmarunnerbot]

✅ Build karma 538 completed (commit 632ce319f5 by @hdmr14)

[hdmr14]

@googlebot I signed it!

[devoto13]

Thanks for the PR, @hdmr14!

It turned out that we didn't have any tests for this functionality, so I've implemented some in devoto13@ee942c5 (going to submit those as a separate PR once yours is merged).

What I found out is that flatMap function is not available in Node 10, which Karma still supports. Can you please update your implementation to make sure that it supports Node 10 as well?

Besides this LGTM

[AppVeyorBot]

✅ Build karma 2941 completed (commit 7e8c7cd539 by @hdmr14)

[karmarunnerbot]

✅ Build karma 544 completed (commit 7e8c7cd539 by @hdmr14)

[karmarunnerbot]

✅ Build karma 543 completed (commit 7e8c7cd539 by @hdmr14)

[hdmr14]

@devoto13 Thanks for review and implement the tests!

PR now supports Node 10(replaced flatMap to map and reduce).

[devoto13]

LGTM

Tests will be added in the follow-up PR: #3661

[hdmr14]

@googlebot I signed it!

[karmarunnerbot]

🎉 This PR is included in version 6.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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