Add helper for getting array namespace from an array

[msimberg]

Extracting from two PRs that implemented the same:

• Cleanup _dsl fields #1052 (comment)
• Domain decomposition and halo construction #540 (comment)

@jcanton I liked your implementation, but (slightly) prefer my name. Feel free to bikeshed.

[github-actions]

Mandatory Tests

Please make sure you run these tests via comment before you merge!

• cscs-ci run default
• cscs-ci run distributed

Optional Tests

To run benchmarks you can use:

• cscs-ci run benchmark-bencher

To run tests and benchmarks with the DaCe backend you can use:

• cscs-ci run dace

To run test levels ignored by the default test suite (mostly simple datatest for static fields computations) you can use:

• cscs-ci run extra

For more detailed information please look at CI in the EXCLAIM universe.

[jcanton]

Suggested change

	def array_ns_from_array(array: NDArray) -> ModuleType:
	def get_array_ns_from_array(array: NDArray) -> ModuleType:

to keep in line with (Magda's?) get/compute/apply

[msimberg]

I must say I don't love adding get etc. everywhere, but I don't object. If you prefer adding it let's do it.