Add types for atob-lite and btoa-lite (#35983)

* Add types for atob-lite

* Add types for btoa-lite

types/atob-lite/atob-lite-tests.ts

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+import atob = require('atob-lite');
+
+atob('PDM=');

types/atob-lite/index.d.ts

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+// Type definitions for atob-lite 2.0
+// Project: https://github.com/hughsk/atob-lite
+// Definitions by: Gregor Martynus <https://github.com/gr2m>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+type DecodedData = string;
+declare function atob(encodedData: string): DecodedData;
+
+export = atob;

types/atob-lite/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": ["index.d.ts", "atob-lite-tests.ts"]
+}

types/atob-lite/tslint.json

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+{ "extends": "dtslint/dt.json" }

types/btoa-lite/btoa-lite-tests.ts

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+import btoa = require('btoa-lite');
+
+btoa('<3');

types/btoa-lite/index.d.ts

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+// Type definitions for btoa-lite 1.0
+// Project: https://github.com/hughsk/btoa-lite
+// Definitions by: Gregor Martynus <https://github.com/gr2m>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+type EncodedData = string;
+declare function btoa(decodedData: string): EncodedData;
+
+export = btoa;

types/btoa-lite/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": ["index.d.ts", "btoa-lite-tests.ts"]
+}

types/btoa-lite/tslint.json

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+{ "extends": "dtslint/dt.json" }