Add type definitions for float-equal version 2.0 (#40195)

types/float-equal/float-equal-tests.ts

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+import floatEqual = require("float-equal");
+
+floatEqual(0.1 + 0.2, 0.3);  // $ExpectType boolean

types/float-equal/index.d.ts

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+// Type definitions for float-equal 2.0
+// Project: https://github.com/sindresorhus/float-equal#readme
+// Definitions by: Dolan Murvihill <https://github.com/dmurvihill>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare function floatEqual(a: number, b: number): boolean;
+export = floatEqual;

types/float-equal/tsconfig.json

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

types/float-equal/tslint.json

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