MessageFormat Parser

Hand-written ICU MessageFormat parser with compatible output as
intl-messageformat-parser
but 6 - 10 times as fast.

Benchmarks

$3

``
$ bazel run //packages/icu-messageformat-parser/benchmark:benchmark
complex_msg AST length 2599
normal_msg AST length 400
simple_msg AST length 79
string_msg AST length 36

complex_msg: 23.85 µs (41,931 ops/sec)
normal_msg: 3.27 µs (306,177 ops/sec)
simple_msg: 0.60 µs (1,675,766 ops/sec)
string_msg: 0.32 µs (3,113,287 ops/sec)
`

$3

The Rust parser (optimized build) is 2.6-3.7x faster than the JavaScript parser:

`
$ bazel run -c opt //crates/icu_messageformat_parser:comparison_bench
complex_msg: 9.22 µs (2.59x faster than JS)
normal_msg: 1.14 µs (2.87x faster than JS)
simple_msg: 163 ns (3.68x faster than JS)
string_msg: 118 ns (2.71x faster than JS)
``

The Rust parser is also 10-11% faster than the SWC ICU MessageFormat parser.