Investigate optimized build setups (e.g. bundling/code-splitting/tree-shaking etc)

[schickling]

We should investigate optimized build setups for Effect CLI apps e.g. using bundling techniques that leverage code-splitting and tree-shaking on a per-command basis. e.g. printing the top-level help command shouldn't yet load all the code for the actual commands etc (see the Oclif docs).