Changes

• BREAKING: Rename 'deno fetch' subcommand to 'deno cache' (#4656)
• BREAKING: Remove std/testing/runner.ts (#4649)
• feat(std/flags): Pass key and value to unknown (#4637)
• feat(std/http): Respond with 400 on request parse failure (#4614)
• feat(std/node): Add exists and existsSync (#4655)
• feat: Add File support in FormData (#4632)
• feat: Expose ReadableStream and make Blob more standardized (#4581)
• feat: add --importmap flag to deno bundle (#4651)
• fix(#4546): Added Math.trunc to toSecondsFromEpoch to conform the result to u64 (#4575)
• fix(file_server): use text/typescript instead of application/typescript (#4620)
• fix(std/testing): format bigint (#4626)
• fix: Drop headers with trailing whitespace in header name (#4642)
• fix: Fetch reference types for JS files (#4652)
• fix: Improve deno doc (#4672, #4625)
• fix: On init create disk_cache directory if it doesn't already exists (#4617)
• fix: Remove unnecessary namespaces in "deno types" (#4677, #4675, #4669, #4668, #4665, #4663, #4662)
• upgrade: Rust crates (#4679)

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