Add minimize a supported MIME type for Fetch and Resource Timing

[annevk]

See WebKit/standards-positions#88 (comment) for rationale. whatwg/fetch#1481 will be updated to call this.

• At least two implementers are interested (and none opposed):
  • Chromium (based on Yoav's comment)
  • WebKit
• Tests are written and can be reviewed and commented upon at:
  • These will be part of the Fetch PR.
• Implementation bugs are filed:
  • See Fetch PR.
• MDN issue is filed: N/A

(See WHATWG Working Mode: Changes for more details.)

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[yoavweiss]

Non-authoritative LGTM