feat(deno): support esbuild

[charsleysa]

• support bundling using deno esbuild
• update generators to use esbuild by default and offering deno_emit as an option
• workaround for Deno build doesn't work when using libraries #309

[charsleysa]

@jaysoo @barbados-clemens if you could look at this one at the same time as taking a look at #305 and #306 that would be much appreciated!

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[barbados-clemens]

couple suggestions.

[barbados-clemens]

this should be the last change needed.
Thanks for all your hard work!