Consolidate protocol versions in `cardano-tools`

[amesgen]

Currently, the Cardano protocol versions are defined twice in ouroboros-consensus-cardano-tools:

• For db-analyser in Cardano.Tools.DBAnalyser.Block.Cardano

  Here, e.g. alonzoProtVer is correctly set to 7 since db-analyser: correct protocol versions ouroboros-network#4377 (note that, somewhat confusingly, this is not the Alonzo protocol version, see this comment):
  

  ouroboros-consensus/ouroboros-consensus-cardano-tools/src/Cardano/Tools/DBAnalyser/Block/Cardano.hs

  Line 329 in eddc225

  alonzoProtVer = ProtVer (SL.natVersion @7) 0

• For db-synthesizer in Cardano.Node.Protocol.Cardano

  Here, e.g. alonzoProtVer is incorrect:
  

  ouroboros-consensus/ouroboros-consensus-cardano-tools/src/Cardano/Node/Protocol/Cardano.hs

  Line 210 in eddc225

  alonzoProtVer = ProtVer (natVersion @6) 0,

The goal of this ticket is to correct these discrepancies by consolidating them. This can serve as the baseline to extract this into a library that can also be reused in the node here, cf. IntersectMBO/ouroboros-network#3925.

---

For your convenience: See this table from CIP-0059 for an overview of the different protocol versions.

[nfrisby]

We chatted and initially think the ouroboros-consensus-cardano package would be a natural place for this consolidated value to be exported.

[nfrisby]

Related to #275

[dnadales]

Note that this will be superseded by #324