feat: add toml-ast — TypeScript TOML parser and deparser

[pyramation]

Summary

New toml-ast package — parse TOML config files into a typed AST and deparse back to TOML strings. Follows the same architecture as nginx-ast, bash-ast, and docker-parser.

Architecture: Lexer → Parser → typed AST → Deparser

import { parse, deparse, cleanTree } from 'toml-ast';

// Parse
const ast = parse(`[server]\nhost = "localhost"\nport = 8080`);

// Build programmatically
const doc: TomlDocument = {
  type: 'TomlDocument',
  body: [{ type: 'Table', key: ..., body: [...] }],
};

// Deparse
const toml = deparse(doc);

// Round-trip compare
expect(cleanTree(parse(toml))).toEqual(cleanTree(ast));

AST node types: TomlDocument, Table, ArrayOfTables, KeyValue, Key/KeyPart (bare/basic/literal styles), StringValue (basic/literal/multiline), IntegerValue (decimal/hex/octal/binary), FloatValue (incl. inf/nan), BooleanValue, DateTimeValue (offset/local-datetime/date/time), ArrayValue, InlineTable, Comment.

Lexer handles: [[/]] disambiguation (array-of-tables headers vs nested arrays), all TOML string types, escape sequences (\n, \uXXXX, \UXXXXXXXX, line-ending backslash), underscored numbers, datetime patterns.

Utilities: cleanTree (strip ranges for comparison), astEqual, printAst.

60 tests (parser, deparser, round-trip) all passing. Use case: programmatic generation of Traefik TOML configs for SSL/Let's Encrypt setups.

Link to Devin session: https://app.devin.ai/sessions/8bc9f253cf9845ef8053f22f92a1b4d8
Requested by: @pyramation

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