Support boolean literals for VectorRepeatValue

[onelson]

The initial work towards wrapping constants/literals for vectorization only covered a subset of literals (int, float, string time). boolean was intended to be included but I (@onelson) was unable to figure out how to get them working on the rust side.

Rust complained about "undefined identifier" for true and false in tests and the bool literal match arm in vectorize() never seemed to match.

Possibly all that's missing is some configuration of the Analyzer but I wasn't sure how to make it work.

DOD:

• boolean literals can "vectorize" by being wrapped with ~~vecRepeat~~() calls
• boolean literals produce VectorRepeatValue instances on the Go side
• tests for both Rust and Go areas of the code

[onelson]

For the "undefined identifier" problem, it seems like the fix is to define the builtin local to the test, as was done here for float:

#5048 (comment)

For booleans, this will mean adding the following to your test source:

builtin true : bool
builtin false : bool

// ... the function to vectorize follows
(r) => ({ r with ... })

[Marwes]

There is also imp

flux/libflux/flux-core/src/semantic/tests.rs

Lines 4205 to 4208 in 2be9804

	imp: map![
	"path/to/foo" => package![
	"f" => " (x: A) => A where A: Addable + Divisible",
	],

and env

flux/libflux/flux-core/src/semantic/tests.rs

Lines 4257 to 4260 in 2be9804

	env: map![
	"findColumn" => "() => [A] where A: Record",
	"yield" => "(<-tables: stream[A]) => stream[A] where A: Record",
	],

to allow for things to be defind before the script.