[TS/JS] Reintroduce legacy single file build for global scope import

[bjornharrtell]

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The suggested way to do this is to use a bundler to create a so called UMD single file build (or IIFE) with entry point 'flatbuffers' from what the TypeScript compiler produces in mjs (ES module output). I recommend https://rollupjs.org/guide/en/.

[bjornharrtell]

This will provide a level of backward compatibility with flatbuffers 1.x that we dropped because lack of interest / resources at the time I did the JavaScript/TypeScript modernization effort.

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