Merge TS & Flow parsers' logic for `Partial` case to `emitPartial` fn & `commonTypes` cases into `emitCommonTypes` fn (#36450)

Summary:
> [Codegen 78 - Assigned to Pranav-yadav] It depends on [Codegen 75][Codegen 76][Codegen 77] Extract the logic that emits Partial values in an emitPartial function, which takes the Parsers as parameter.

>[Codegen 79 - Assigned to Pranav-yadav] It depends on [Codegen 78] Extract the basic cases logics (case Stringish, case Int32, case Double, ..., case Partial. `Flow` lines and `TypeScript` lines into a function emitCommonTypes in `parsers-primitives.js`. Make sure that the default case returns `null`. Call this function in the default: case `Flow`, `TypeScript` of the `index.js` file: if the function return something, return that from the default case; otherwise if the `emitCommonTypes` returns `null`, keep the current default implementation (throw the error).

### Changes

- merged TS & Flow parsers' logic for `Partial` case to `emitPatial` fn
- merged TS & Flow parsers' logic for below cases:
  - `Stringish`
  - `Int32`
  - `Double`
  - `Float`
  - `UnsafeObject`
  - `Object`
  - `Partial`
- into an `emitCommonTypes` fn into `parsers-primitives.js`
- add **_tests_** for `emitPartial` and `emitCommonTypes` fn's
- add `getAnnotatedElementProperties` fn to parser & impl to both TS & Flow parsers

## Changelog:

[INTERNAL] [CHANGED] - Merge TS & Flow parsers' logic for `Partial` case to `emitPatial` fn & `commonTypes` cases into `emitCommonTypes` fn

Pull Request resolved: https://github.com/facebook/react-native/pull/36450

Test Plan: - `yarn lint && yarn run flow && yarn jest react-native` ⇒ �

Reviewed By: rshest

Differential Revision: D44132308

Pulled By: cipolleschi

fbshipit-source-id: f965e85ecc5d94e57ad85334ce565a55c512fde4