MigTD v0.4.2 Release

Release content:

• config: Update pre-production policy
• config: Update production policy
• policy: support multiple TdxModuleIdentities
• migtd-policy-generator: enumerate tdxModuleIdentities
• migtd: use shared memory shadow provided by td-payload
• deps: upgrade td-shim submodule
• config: adjust image layout and metadata for debug image
• config: adjust image layout and metadata for debug image
• migtd: remove all the information output through println
• fix warnings reported by clippy
• policy: log detail error info in policy crate

Known issues:

• No known issue

For detailed changes please refer to https://github.com/intel/MigTD/issues?q=is%3Aissue+is%3Aclosed