Export useful variables from test runnables. Create tasks for tests.

[luxmentis]

Added tasks to enable test execution using runnable triangles. Supports both XCTest and Swift Testing libraries.

Runnables now export useful variables, which enables users to write custom testing tasks (e.g. for xcode projects – outside the scope of this plugin).

Note I'm not really clear on the reason for the underscore captures like @_name and @_tag-name in the existing code, so I've mostly left @_name in place and created @_tag-name ones. Let me know if I've done something wrong.

I haven't done anything for Quick tests (not a Quick user, and it's not an Apple library) and have left those runnables as-is.

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[luxmentis]

@cla-bot check

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[luxmentis]

@cla-bot check

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