Add streaming parser API for large message handling

[konard]

Summary

• Adds StreamParser class to JavaScript and Rust implementations for efficient streaming parsing of large Links Notation messages
• Adds ParseError/StreamParseError types with detailed location information (line, column, offset)
• Updates documentation with streaming parser examples and API reference
• Bumps version from 0.13.0 to 0.14.0

Features

JavaScript StreamParser

import { StreamParser, ParseError } from 'links-notation';

const parser = new StreamParser();

parser.on('link', (link) => {
  // Process each link as it's parsed
  console.log(link);
});

parser.on('error', (error) => {
  // Handle parse errors with location info
  console.error(`Error at line ${error.line}, col ${error.column}: ${error.message}`);
});

// Feed data incrementally
parser.write(chunk1);
parser.write(chunk2);
const links = parser.end();

Rust StreamParser

use links_notation::stream_parser::StreamParser;

let mut parser = StreamParser::new();

parser.on_link(|link| {
    println!("{:?}", link);
});

parser.write(chunk1)?;
parser.write(chunk2)?;
let links = parser.finish()?;

Benefits

1. Memory efficiency: Process large messages without loading everything into memory
2. Low latency: Start processing before the full message is received
3. Detailed error reporting: Errors include line and column information for debugging
4. Event-based API: Receive links as they are parsed

Test plan

• Added 35 unit tests for JavaScript StreamParser
• Added 14 unit tests for Rust StreamParser (plus 5 doc tests)
• All existing tests continue to pass (223 JS tests, 200+ Rust tests)
• Verified streaming parser produces same results as regular Parser
• Tested incremental input, buffering, error handling, and reset functionality

Fixes #197

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[konard]

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