bats: Add library wrapper

Adds a `bats.withLibraries (p: [ ... ])` function, which creates a
`bats` wrapper where the `BATS_LIB_PATH` environment variable contains
fallbacks for the given list of libraries.

This allows to e.g. use the `bats-assert` library (which itself requires the
`bats-support` library) with

    bats.withLibraries (p: [ p.bats-support p.bats-assert ])

In a `.bats` file you can then call `bats_load_library` [1] to load the
libraries in the `setup()` function:

    setup() {
      bats_load_library bats-support
      bats_load_library bats-assert
    }

[1]: https://bats-core.readthedocs.io/en/stable/writing-tests.html?highlight=library#bats-load-library-load-system-wide-libraries

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