Changes

• feat(std/http): support trailer headers (#3938, #3989)
• feat(std/node): Add readlink, readlinkSync (#3926)
• feat(std/node): Event emitter node polyfill (#3944, #3959, #3960)
• feat(deno install): add --force flag and remove yes/no prompt (#3917)
• feat: Improve support for diagnostics from runtime compiler APIs (#3911)
• feat: deno fmt - formats stdin and print to stdout (#3920)
• feat: add std/signal (#3913)
• feat: make testing API built-in Deno.test() (#3865, #3930, #3973)
• fix(std/http): align serve and serveTLS APIs (#3881)
• fix(std/http/file_server): don't crash on "%" pathname (#3953)
• fix(std/path): Use non-capturing groups in globrex() (#3898)
• fix(deno types): don't panic when piped to head (#3910)
• fix(deno fmt): support top-level await (#3952)
• fix: Correctly determine a --cached-only error (#3979)
• fix: No longer require aligned buffer for shared queue (#3935)
• fix: Prevent providing --allow-env flag twice (#3906)
• fix: Remove unnecessary EOF check in Deno.toAsyncIterable (#3914)
• fix: WASM imports loaded HTTP (#3856)
• fix: better WebWorker API compatibility (#3828 )
• fix: deno fmt improvements (#3988)
• fix: make WebSocket.send() exclusive (#3885)
• refactor: Improve deno bundle by using System instead of AMD (#3965)
• refactor: Remove conditionals from installer (#3909)
• refactor: peg workers to a single thread (#3844, #3968, #3931, #3903, #3912, #3907, #3904)

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