Static methods for TextEncoder and TextDecoder

[lucacasonato]

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NOTE: this PR is currently blocked on a technicality (https://github.com/tabatkins/bikeshed/issues/2270).

This PR adds support for static TextDecoder.decode, TextEncoder.encode and TextEncoder.encodeInto methods. These do not add new functionality, rather just acting as useful helpers for "one time" text encoding/decoding operations.

Closes #267.

• [ ] At least two implementers are interested (and none opposed):
  • Deno
  • …
• [ ] Tests are written and can be reviewed and commented upon at:
  • …
• [ ] Implementation bugs are filed:
  • Chrome: …
  • Firefox: …
  • Safari: …
  • Deno: …
  • Node.js: …

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[jasnell]

@lucacasonato ... are you still wanting to push this forward. I'm interested in implementing this for both workers and node.js