Bracket list expression for initialization without escaping

[oowekyala]

Add an expression kind for Python and TS lists, and Rust arrays.

Fix #1981

This requires an update to the website.

[lhstrh]

Fantastic! This is really nice, @oowekyala. It occurs to me that even if we were to aim for a clearer separation between target code and LF code, initializers are probably the places where it would remain to pay off to elegantly mix languages (i.e., without escaping)...

[lhstrh]

Looks like our build-epoch workflow doesn't deal well with forks. It's failing because it is attempting to resolve the ref clem.bracket-list-expr that corresponds to this PR in the lf-lang repo instead of your fork... I guess the workflow should take as input a string that identifies the fork and then just replace the lingua-franca submodule before checking out the given ref...

[lhstrh]

Looks like our build-epoch workflow doesn't deal well with forks. It's failing because it is attempting to resolve the ref clem.bracket-list-expr that corresponds to this PR in the lf-lang repo instead of your fork... I guess the workflow should take as input a string that identifies the fork and then just replace the lingua-franca submodule before checking out the given ref...

OK, fixed this!

[oowekyala]

Thanks Marten for fixing the CI!

[lhstrh]

Looks great!

[cmnrd]

This looks great! The only request I have, is that more Python tests should be updated. For instance ArrayAsParamenter.lf still uses the old syntax. There might be more.

This is beyond this PR, but we should soon remove the old name(<expr>*) syntax (#1675).

Fixed the test you mentioned; didn't find any others.