refactor: Centralized input validation (#142)

* Initial implementaion of service account json, user fraction and status validation

* Move validation to input-validation
Also created some more validators

* Rearrange whatsnew tests to clear out test folder

* Return error messages for input validation

* Create tests for some validation code

* Separate user fraction and status validation

* Write more tests and fix some bugs

* Refactor to use promises

* Fix release file loading from glob

__tests__/input-validation.test.ts

@@ -0,0 +1,74 @@
+import { validateInAppUpdatePriority, validateReleaseFiles, validateStatus, validateUserFraction } from "../src/input-validation"
+
+test("invalid in-app update priority fails validation", async () => {
+    const testValues = [-1, 6, -1000, 1000]
+    for (const value of testValues) {
+        await expect(validateInAppUpdatePriority(value)).rejects.toThrowError()
+    }
+})
+
+test("valid in-app update priority passes validation", async () => {
+    const testValues = [0, 1, 2, 3, 4, 5, undefined]
+    for (const value of testValues) {
+        await validateInAppUpdatePriority(value)
+    }
+})
+
+test("invalid releaseFiles glob fails validation", async () => {
+    const testValues = ['./__tests__/releasefiles/*.null', `./__tests__/releasefiles/nonexistent-release.aab`]
+    await expect(validateReleaseFiles(testValues)).rejects.toThrowError()
+})
+
+test("valid releaseFiles glob passes validation", async () => {
+    const testValues = ['./__tests__/releasefiles/*.aab', `./__tests__/releasefiles/release.aab`]
+    await validateReleaseFiles(testValues)
+})
+
+test("fractionless status without fraction passes validation", async () => {
+    const testValues = ['completed', 'draft']
+    for (const value of testValues) {
+        await validateStatus(value, false)
+    }
+})
+
+test("fractionless status with fraction fails validation", async () => {
+    const testValues = ['completed', 'draft']
+    for (const value of testValues) {
+        await expect(validateStatus(value, true)).rejects.toThrowError()
+    }
+})
+
+test("fractioned status without fraction fails validation", async () => {
+    const testValues = ['inProgress', 'halted']
+    for (const value of testValues) {
+        await expect(validateStatus(value, false)).rejects.toThrowError()
+    }
+})
+
+test("fractioned status with fraction passes validation", async () => {
+    const testValues = ['inProgress', 'halted']
+    for (const value of testValues) {
+        await validateStatus(value, true)
+    }
+})
+
+test("invalid status fails validation", async () => {
+    const testValues = ['statusGoBrrr', undefined]
+    for (const value of testValues) {
+        await expect(validateStatus(value, true)).rejects.toThrowError()
+    }
+})
+
+test("invalid user fraction fails validation", async () => {
+    const testValues = [0, 1, -1, 2, NaN]
+    for (const value of testValues) {
+        await expect(validateUserFraction(value)).rejects.toThrowError()
+    }
+})
+
+test("valid user fraction passes validation", async () => {
+    const testValues = [0.1, 0.9, 0.5, undefined]
+    for (const value of testValues) {
+        await validateUserFraction(value)
+    }
+})