Make wasm-bindgen-interning a feature

[lukechu10]

The wasm-bindgen-interning feature in turn enables the wasm-bindgen/enable-interning feature.
This feature is on by default.

[codecov-commenter]

Codecov Report

Merging #296 (542462b) into master (c890039) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #296   +/-   ##
=======================================
  Coverage   74.93%   74.93%           
=======================================
  Files          33       33           
  Lines        4800     4800           
=======================================
  Hits         3597     3597           
  Misses       1203     1203           

Impacted Files	Coverage Δ
packages/sycamore/src/lib.rs	100.00% <ø> (ø)
packages/sycamore/src/portal.rs	0.00% <ø> (ø)

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