feat(typescript-types): Add Get<O, P>

packages/typescript-types/test/get.tst.ts

@@ -0,0 +1,19 @@
+import type { Get } from '@/get.js'
+import { expect } from 'tstyche'
+
+interface Example1 {
+	requiredKey: number
+	optionalKey?: number
+	unknownNonOptionalKey: unknown
+	undefinedNonOptionalKey: undefined
+	neverKey: never
+	subkey: {
+		name: string
+		age: number
+	}
+}
+
+expect<Get<Example1, 'requiredKey'>>().type.toBe<number>()
+expect<Get<Example1, 'optionalKey'>>().type.toBe<number | undefined>()
+expect<Get<Example1, 'subkey.age'>>().type.toBe<number>()
+expect<Get<Example1, 'unknownNonOptionalKey'>>().type.toBe<unknown>()