chore: bench TOML

Adds a TOML corpus of the files taplo parses, taplo 0.10.0 and
tombi 1.9.8 as native binaries, dprint-plugin-toml in the dprint
harness, and bun, which formats TOML too. Prettier has no TOML row.
On 375 files: tidy 8.6 ms, taplo 18.4, dprint 22.9, bun 32.4,
tombi 79.9.