Feature/playground parameters

[emuell]

Add template parameter support to the web playground example.

[github-actions]

Benchmark for d174bef

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Test	Base	PR	%
Cycle/Generate	48.2±0.61µs	48.7±0.39µs	+1.04%
Cycle/Parse	364.9±4.93µs	366.8±3.66µs	+0.52%
Rust Phrase/Clone	434.6±3.48ns	435.1±4.98ns	+0.12%
Rust Phrase/Create	72.5±0.88µs	75.3±2.48µs	+3.86%
Rust Phrase/Run	632.9±3.17µs	624.3±10.00µs	-1.36%
Rust Phrase/Seek	132.9±244.05µs	135.1±249.09µs	+1.66%
Scripted Phrase/Clone	648.0±3.40ns	660.5±8.92ns	+1.93%
Scripted Phrase/Create	948.1±47.51µs	950.3±9.07µs	+0.23%
Scripted Phrase/Run	1688.5±26.26µs	1678.1±16.47µs	-0.62%
Scripted Phrase/Seek	224.3±454.99µs	222.0±450.38µs	-1.03%