Utilize CPU better when loading modules

[radeksimko]

Closes #186

While the number of operations in parallel is capped, we can still overutilize the available CPU as per

terraform-ls/internal/terraform/module/module_manager.go

Line 46 in d31f6b4

defaultSize := 3 * runtime.NumCPU()

(prior to #385)

and now

terraform-ls/internal/terraform/module/module_loader.go

Lines 25 to 26 in f5ddf9a

	nonPrioParallelism := 2 * runtime.NumCPU()
	prioParallelism := 1 * runtime.NumCPU()

This patch therefore ensures that except for single-core we never run more threads than there is CPUs available, which should provide some relief to users with many modules in the hierarchy.

[aeschright]

LGTM!

[ghost]

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