Add indentation rule for array creation expressions

[carestad]

Adds indentation rules for PHP array creation expressions.

Pressing Enter after an opening [ or array( left the new line at column 0. indents.scm only matched nodes containing {/}, so neither array form was covered - both use brackets or parentheses.

Before:

$foo->bar([
line at column 0
]);

After:

$foo->bar([
    line indented one level
]);

Both short [] and legacy array() syntax are handled; in tree-sitter-php both produce an array_creation_expression` node, differing only in the closing delimiter.

Note the rules are scoped to array_creation_expression rather than matching ] or ) generally, since ] also closes array access ($foo['bar']).

Tested locally on Zed v1.13.1 with a fresh profile.

Fixes #138

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[carestad]

@cla-bot check

[cla-bot]

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[MrSubidubi]

Looks good, but needs some reformatting as noted in CI. Could you look into that, please?

[carestad]

Looks good, but needs some reformatting as noted in CI. Could you look into that, please?

@MrSubidubi Sure thing! Should be updated now 🙂