feat(primitives): support multiple Plutus language cost models in script data

[scarmuega]

Supersedes #730 — rebased onto current main to resolve a conflict in pallas-primitives/src/conway/script_data.rs with the recent const → static LazyLock clippy fix (a9e538a). Original work and authorship by @nicolasLuduena.

Summary

• Replace LanguageView(PlutusVersion, CostModel) with LanguageViews(BTreeMap<PlutusVersion, CostModel>) so a single transaction can carry cost models for multiple Plutus versions simultaneously.
• Update ScriptData to canonically encode the multi-language map (V2/V3 sorted, then V1 last because it CBOR-encodes as 0x4100).
• Refactor the txbuilder API: StagingTransaction.language_view → language_views; the old .language_view(kind, cm) setter is replaced by .language_views(views) (set whole map) and .add_language(kind, cm) (incremental).
• Fix pallas-validate::tx_languages so it returns all languages present in a tx (previously dropped V3 when V1+V2+V3 were all in use, and only ever returned the highest single language). cost_model_for_tx now builds a LanguageViews covering every language in the tx.
• Add test vector test_data/conway9.tx exercising a transaction with all three Plutus versions.

Breaking changes

Public API: LanguageView → LanguageViews; ScriptData.language_view → language_views; StagingTransaction.language_view field and .language_view(...) builder method renamed/replaced as above.

Test plan

• cargo build --workspace --tests clean
• cargo test -p pallas-primitives script_data (multi-language hash vector)
• cargo test -p pallas-txbuilder
• cargo test -p pallas-validate

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b97f313e-cc5f-4296-b629-41e808afe6f3

📥 Commits

Reviewing files that changed from the base of the PR and between b221e35 and ea7d2e3.

📒 Files selected for processing (6)

• pallas-primitives/src/conway/script_data.rs
• pallas-txbuilder/src/conway.rs
• pallas-txbuilder/src/transaction/model.rs
• pallas-txbuilder/src/transaction/serialise.rs
• pallas-validate/src/phase1/conway.rs
• test_data/conway9.tx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch script-data-multiple-languages

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