Expose type with combined "ParseRequestOptions" and "flushTimeout"

[rchl]

The requestHandler can be passed various options and currently the types for those options are defined as an union of types ParseRequestOptions & { flushTimeout?: number; }:

sentry-javascript/packages/node/src/handlers.ts

Lines 249 to 252 in a0b636b

	export function requestHandler(
	options?: ParseRequestOptions & {
	flushTimeout?: number;
	},

The issue is that the combined type is not exported so libraries that provide a higher-level configuration on top of Sentry can't import and use that type directly but have to create a similar union of types. And that can get out of sync with Sentry implementation.

The suggestion is to just create a separate type for this union so that it's exported from the module and can be used directly.