fix(luau): preserve space after read/write modifier in array types

[cschanhniem]

The TypeInfo::Array formatter merges the access modifier (read/write) into the element type, changing code meaning. For example:

-- input
type A = { read Service }
-- output (before fix)
type A = { readService }
-- output (after fix)
type A = { read Service }

stylua --verify correctly detects the AST mismatch, but the formatter still produces the broken output.

Root cause

In src/formatters/luau.rs, the TypeInfo::Array arm formats the access token via format_token_reference without re-adding trailing trivia. The sibling format_type_field function handles this by calling .update_trailing_trivia(FormatTriviaType::Append(...)) with a space token.

Fix

1. Singleline path: Append trailing space after the access token (matching format_type_field behavior)
2. Multiline path: Place indent trivia on the access token instead of the element type (the current behavior puts indent between the modifier and the type, causing read\tService on a new line)

The multiline case also now positions the access token with proper leading indent for the multiline layout.

Fixes #1126