ets2panda: Big refactoring and fixup for enum · Pull Request !1902 · OpenHarmony/arkcompiler_ets_frontend

## Brief
So far it is only placeholder/draft. Description will be added later.

This PR is to fix [Big refactoring for enum](https://gitee.com/openharmony/arkcompiler_ets_frontend/issues/I8G6TY) issue.

Change-Id: I1444de55531184217c81f629ec981d0b30cf29cc

## The main idea
The main idea is the change of EnumDeclaration ast node to ClassDeclaration in a lowering pass. Below an example of such change.

```
enum Size { A=1, B=2, C=3 };
```

will be changed to ast representation of

```
class Size extends EnumIntType  {
	static A: Size = Sz.create("#Enum#Size", "A", 1, 0)
	static B: Size = Sz.create("#Enum#Size", "B", 2, 1)
	static C: Size = Sz.create("#Enum#Size", "C", 3, 2)

static arr: Size[] = [Size.A, Size.B, Size.C]

private static create (typ: string, name: string, val1: Int, idx: int): Size {
		let ret = new Size()
		ret.init(typ, name, val1)
		return ret
	}

static values() {
		return Size.arr
	}

static valueOf(name: string): Size throws {
		return enumValueOf<Int>(Size.arr, name) as Size
	}
}
```

类型	指派人员	状态
审查	@egavrin 由 CODEOWNERS 文件第 15 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	进行中 (0/1人)

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