[core] use separate version for different platforms

[jeremymeng]

For example, currently we have mixed usages of NodeJS and browser APIs in

azure-sdk-for-js/sdk/core/ts-http-runtime/src/interfaces.ts

Lines 61 to 66 in 76f0890

	body:
	| ((() => ReadableStream<Uint8Array>) | (() => NodeJS.ReadableStream))
	| ReadableStream<Uint8Array>
	| NodeJS.ReadableStream
	| Uint8Array
	| Blob;

Ideally, we would have a NodeJS version, and a browser version, each uses their supported API. Then our type checking can be more accurate by including correct version.