Prepare @nestia/migrate's next update

[samchon]

This pull request includes several updates and improvements to the @nestia/migrate package, focusing on version upgrades, dependency additions, and code simplifications. The most important changes are listed below.

Version and Dependency Updates:

• Updated the package version to 0.21.0-dev.20241127 and upgraded several dependencies, including @nestia/benchmark, @nestia/core, @nestia/fetcher, and added new dependencies such as @types/multer and multer. (packages/migrate/package.json [1] [2] [3] [4]

Code Simplifications:

• Simplified the access pattern in MigrateApiFunctionProgrammer by directly passing string literals instead of using IdentifierFactory.access. (packages/migrate/src/programmers/MigrateApiFunctionProgrammer.ts [1] [2] [3]
• Replaced LiteralFactory.generate with LiteralFactory.write in MigrateApiNamespaceProgrammer for better clarity and consistency. (packages/migrate/src/programmers/MigrateApiNamespaceProgrammer.ts [1] [2] [3] [4] [5] [6]
• Updated StatementFactory.constant to use an object with name and value properties in MigrateApiSimulatationProgrammer and MigrateApiStartProgrammer. (packages/migrate/src/programmers/MigrateApiSimulatationProgrammer.ts [1] [2] [3] [4]; packages/migrate/src/programmers/MigrateApiStartProgrammer.ts [5] [6]

Function and Method Enhancements:

• Enhanced MigrateNestMethodProgrammer to handle multipart form data by adding arguments to writeDtoParameter calls and improving the handling of SwaggerExample decorators. (packages/migrate/src/programmers/MigrateNestMethodProgrammer.ts [1] [2] [3] [4] [5] [6] [7]

These changes aim to improve the maintainability, readability, and functionality of the @nestia/migrate package.