[JavaSpring] Fixed Issue 9250 - Codegen for file datatype (#9490)

• ref CVE-2020-25649 - jackson 2.11.4 (#10926)
• added option to write a throwing exception for unknown enums values. (#10356)
• Add new additional-property ignoreUnknownJacksonAnnotation to add a class level annotation @JsonIgnoreProperties(ignoreUnknown = true) (#10953)
• [Python] Fix #10948 wrong mode opened file fixed (#10949)
• Go deni issue 10948 (#10957)
• [go] object to interface code generator should never generate an interface pointer (#10932)
• Fix code generation for Angular 10 (#10464)
• Write mustache template to generate Protocol Oriented class file from swagger for Swift5 (#10868)
• Update README.md (#10923)