tx-generator: cleanup handling of protocol parameters

[MarcFontaine]

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On the chain protocol parameters can be updated. Currently the tx-generator queries the local node for the current state of the protocol parameters. This is problematic for several reasons:

• The behavior of the tx-generator becomes highly dynamic and difficult to debug.
• It is difficult the add stand-alone tests that run without a connection to a node.
• The tx-generator samples the protocol parameters only once (or a view times) at certain moments it may miss updates on the chain.

The protocol parameters are important for handling fees, Plutus fees and min-value-per-UTxO and this determines how the tx-generator splits funds to generate UTxOs.

A possible way around this is to use an approximation of the protocol parameters with safe lower/upper bounds of fees etc. It is safe to declare higher fees in for a tx than actually required

[MarcFontaine]

It would also be nice to extract the protocol parameters from the node-config. This should be in theory be possible. The node-config contains all the needed data. But there is no easy/obvious way to do it.

[deepfire]

Waiting on @Jimbo4350 for assistance.

[github-actions[bot]]

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