RUM - Add Source Map Intake API endpoint specification

tests/scenarios/features/v2/fixtures/sourcemap_intake/android/mapping.txt

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+# ProGuard/R8 mapping file
+# Generated for testing purposes
+
+com.example.app.MainActivity -> a.a.a:
+    void onCreate(android.os.Bundle) -> a
+    void onResume() -> b
+    void onPause() -> c
+
+com.example.app.utils.NetworkHelper -> a.a.b:
+    java.lang.String baseUrl -> a
+    void sendRequest(java.lang.String) -> a
+    void handleResponse(java.lang.String) -> b
+
+com.example.app.models.User -> a.a.c:
+    java.lang.String name -> a
+    java.lang.String email -> b
+    int getId() -> a
+    void setId(int) -> a

tests/scenarios/features/v2/fixtures/sourcemap_intake/flutter/app.symbols

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+Flutter symbol file for crash symbolication testing
+Platform: android
+Architecture: arm64
+Variant: release
+Build: test-flutter-app-1.0.0
+
+Symbol Table:
+0x00001000 _kDartIsolateSnapshotData
+0x00002000 _kDartIsolateSnapshotInstructions
+0x00003000 _kDartVmSnapshotData
+0x00004000 _kDartVmSnapshotInstructions

tests/scenarios/features/v2/fixtures/sourcemap_intake/javascript/main.min.js

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+function hello() {
+  console.log("Hello World");
+}
+function greet(n) {
+  return "Hello, " + n;
+}

tests/scenarios/features/v2/fixtures/sourcemap_intake/react_native/main.jsbundle.map

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+{
+  "version": 3,
+  "file": "main.jsbundle",
+  "sources": ["App.js", "components/Button.js"],
+  "sourcesContent": [
+    "import React from 'react';\nexport default function App() {\n  return <View />;\n}\n",
+    "import React from 'react';\nexport function Button({ onPress }) {\n  return <TouchableOpacity onPress={onPress} />;\n}\n"
+  ],
+  "names": ["React", "App", "View", "Button", "onPress", "TouchableOpacity"],
+  "mappings": "AAAA,OAAOA,KAAK,MAAM,QAClB,eAAe,SAASC,MACxB,OAAOC"
+}