Support multiline inline tables (TOML 1.1.0)

[gildor]

TOML 1.1 allows inline tables to span multiple lines, with optional trailing commas and comments between key-value pairs (spec PR #904).

# This is valid TOML 1.1:
contact = {
    name = "Donald Duck",       # comments allowed
    email = "donald@duck.com",  # trailing comma allowed
}

# Nested multiline inline tables:
config = {
    personal = {
        name = "Donald Duck",
        email = "donald@duckburg.com",
    },
    work = {
        name = "Coin cleaner",
        email = "donald@ScroogeCorp.com",
    },
}

Current behavior

ktoml 0.7.1 crashes with:

Requested character count -1 is less than zero

So what must be supported changes:

1. Newlines allowed between key-value pairs (via ws-comment-newline)
2. Trailing comma permitted after the last key-value pair
3. Comments allowed inside multiline inline tables

References

#360 - could be related, to this work, so will see how it goes

[gildor]

I'm thinking about extend the existing MultilineType / TomlMultilineString mechanism - the same pattern already used for multiline arrays:

1. Add INLINE_TABLE to MultilineType enum ("{", "}", isNestedSupported = true)
2. Update getMultilineType() in TomlMultilineString.kt to detect when a value starts with { but doesn't have a matching } on the same line
3. Reuse parseMultiline() - it already handles bracket matching, comment stripping, and line joining. The joined single-line result feeds into the existing inline table parser.
4. Remove trailing comma rejection - TomlInlineTable.parseInlineTableValue() currently throws ParseException for trailing commas. Remove this check and trim trailing commas before splitting.
5. Extend writer - TomlInlineTable.write() has a multiline property but only uses it for arrays. Extend to support InlineTableType.PRIMITIVE with indentation and newlines.

Let' me do if there is a better way