refactor(binary): internal update float<>int conversions, migrate IS_LE flag

- update to re-use LE/BE buffers
- migrate `IS_LE` to endianess.ts

Author: postspectacular

packages/binary/src/float.ts

@@ -1,16 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 import type { FnN, FnN2, FnN3 } from "@thi.ng/api";
-
-const F64 = new Float64Array(1);
-const F32 = new Float32Array(F64.buffer);
-const U8 = new Uint8Array(F64.buffer);
-const I32 = new Int32Array(F64.buffer);
-const U32 = new Uint32Array(F64.buffer);
-
-/**
- * This value is true iff the environment is Little Endian.
- */
-export const IS_LE = ((U32[0] = 1), U8[0] === 1);
+import { IS_LE } from "./endianess.js";
+import { F32, F64, I32, U32 } from "./buffers.js";
 
 export const floatToIntBits: FnN = (x) => ((F32[0] = x), I32[0]);