feat(goctl): better generate the api code of typescript

[foliet]

When generating the api code of typescript, if the tag contains the options modifier, the union type is generated instead of the declared type. Here is an example.

Api:

type SomeType {
	Foo string `json:"foo,options=foo,bar,options,123"`
	Bar int `json:"bar,options=1,3,4,123"`
}

Typescript:

export interface SomeType {
    foo: 'foo' | 'bar' | 'options' | '123'
    bar: 1 | 3 | 4 | 123
}

This can provide a good intelligent complement for the front-end IDE.

I have completed the test file.

[foliet]

As a comparison, the past output is:

export interface SomeType {
    foo: string
    bar: number
}

[kevwan]

No need to define type in ts?

As a comparison, the past output is:

export interface SomeType {
    foo: string
    bar: number
}

[foliet]

No need to define type in ts?

As a comparison, the past output is:

export interface SomeType {
    foo: string
    bar: number
}

This is the syntax feature of typescript, called union type

IDE can know which options are available for this variable