Nydus Image Service v2.1.0-rc.2

What's Changed

• builder: fix panic on building big file by @imeoer in #663
• Fix test by @changweige in #665
• Rename nydusctl subcommand by @changweige in #666
• storage: use dyn BlobChunkInfo in storage layer by @changweige in #664
• storage/backend: use rate log to prevent tons of logs by @changweige in #669
• nydusify: infer BackendType and BackendConfig by @wraymo in #618
• storage: avoid allocating memory when requesting registry by @changweige in #673
• README.md: add description about CRI-O / Podman support by @hsiangkao in #677
• nydusctl: beautify backend metrics display by @changweige in #679
• nydusctl: print rafs read op latency distribution by @changweige in #680
• storage: clear some dead code by @changweige in #681
• builder: only reference the blob actually used in the chunk dict by @imeoer in #678
• storage: don't drop tokio runtime to non-blocking context by @changweige in #682
• rafs: optimize entry search in rafs v6 by @yixiaojie0x in #683
• release: prepare for v2.1.0-rc.2 by @imeoer in #685

Full Changelog: v2.1.0-rc.1...v2.1.0-rc.2