Avoid long functions ETSCompiler::CompileCast( ... ) · Pull Request !1768 · OpenHarmony/arkcompiler_ets_frontend

**PR Description**

This PR is to fix the following issue(s):

- [ets2panda/compiler/core/ETSCompiler.cpp:1745 Avoid long functions](https://gitee.com/openharmony/arkcompiler_ets_frontend/issues/I8XTQM)

**Reason**

Avoid long functions and ensure that functions contain no more than 50 lines (not including blank lines and comments). Function has 61 lines.

Need to reduce the size of function void ETSCompiler::CompileCast(const ir::TSAsExpression *expr) const.

**Description**

As a solution, it is proposed to split the function into 2 methods: ETSCompiler::CompileCast(...) and ETSGen::CastTo(...). Place everything related to type casting in CastTo(...) and replace the switch-case with std::unordered_map.

**Test scenarios**

1) Run compile on CI/CD
Expected behavior: CI/CD pass

2) Check that the current behavior has not changed after edits
Expected behavior: Сurrent behavior has not changed **PR Description**

This PR is to fix the following issue(s):

- [ets2panda/compiler/core/ETSCompiler.cpp:1745 Avoid long functions](https://gitee.com/openharmony/arkcompiler_ets_frontend/issues/I8XTQM)

**Reason**

Avoid long functions and ensure that functions contain no more than 50 lines (not including blank lines and comments). Function has 61 lines.

Need to reduce the size of function void ETSCompiler::CompileCast(const ir::TSAsExpression *expr) const.

**Description**

As a solution, it is proposed to split the function into 2 methods: ETSCompiler::CompileCast(...) and ETSGen::CastTo(...). Place everything related to type casting in CastTo(...) and replace the switch-case with std::unordered_map.

**Test scenarios**

1) Run compile on CI/CD
Expected behavior: CI/CD pass

2) Check that the current behavior has not changed after edits
Expected behavior: Сurrent behavior has not changed

类型	指派人员	状态
审查	@egavrin 由 CODEOWNERS 文件第 18 行指派为审查者	进行中 (0/1人)
审查	godmiaozi zhuoli72 徐城	进行中 (0/1人)
测试	openharmony_ci 已测试通过	已完成 (1/1人)

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