chore: use esbuild instead of webpack for building

[sidvishnoi]

Context

Closes #360

Changes proposed in this pull request

• Replaces webpack with esbuild
  • We now get better sourcemaps and build speed.
• Updates build command syntax a bit
• Reduced build size by roughly 100KB 20KB (#498 reduced by 80KB with mangling support)

[raducristianpopa]

Extension builds preview

Name	Link
Latest commit	aa89ea7
Latest job logs	Run #10450079568
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[raducristianpopa]

It looks like the esbuild-node-builtin is injecting the Buffer in all entrypoints. This is happening because the plugin is using the inject API for Buffer.

In the built monetization polyfill:

 function mr(t, r) {
    if (g(r)) {
      var n = L(r.length) | 0
      return (t = F(t, n)), t.length === 0 || r.copy(t, 0, 0, n), t
    }
    if (r) {
      if (
        (typeof ArrayBuffer < 'u' && r.buffer instanceof ArrayBuffer) ||
        'length' in r
      )
        return typeof r.length != 'number' || Yr(r.length) ? F(t, 0) : M(t, r)
      if (r.type === 'Buffer' && J(r.data)) return M(t, r.data)
    }
    throw new TypeError(
      'First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.'
    )
  }
  function L(t) {
    if (t >= d())
      throw new RangeError(
        'Attempt to allocate Buffer larger than maximum size: 0x' +
          d().toString(16) +
          ' bytes'
      )
    return t | 0
  }
  a.isBuffer = Lr

[raducristianpopa]

Done during pair-programming.