Remove `dagconfig` dependency from `txscript` package

[conorpp]

Right now the txscript package is incredibly useful for integration, but it necessarily references a non-portable package "go-muhash". This go-muhash relies on some CGo linking and is not very portable (e.g. it makes static compilation impossible).

txscript references dagconfig package which references go-muhash. Could we push the high-level functions that use dagconfig into a subpackage? This would resolve this issue.

[someone235]

This repo is deprecated, but I would merge such PR if you'll write one.
You can also use the wasm integration: https://kaspa.aspectron.org/integrating-wasm/index.html