fix: properly capture Rust array expressions

[xzfc]

Issue

Contents of Rust array_expressions is ignored. E.g. the following pattern:

language rust
`[foo, bar, baz]`

Matches every line of the following snippet:

[];
[a];
[a, b, c];

Cause

It seems that the cause is that the array_expression rule captures only the length field (e.g., 32 in [0u8; 32]), but not anything else.
https://github.com/getgrit/gritql/blob/5af841f57592f287bdd736a87ec4008c77d88603/resources/node-types/rust-node-types.json#L522-L536

Fix in this PR

This PR adds fields repeat (e.g., 0u8 in [0u8; 32]) and elements (e.g. a,b,c in [a,b,c]).
Related Rust reference page: https://doc.rust-lang.org/reference/expressions/array-expr.html

[morgante]

Thanks! Can you please add a test case too? https://github.com/getgrit/gritql/blob/main/crates/core/src/test.rs