feat(integrations): add prisma Stripe catalog provider

[snowmead]

Summary

• Adds the prisma Stripe Projects catalog integration family as CatalogResource adapter(s).
• Follows docs/ADDING-A-PROVIDER.md and docs/PROVIDER-WAVES.md.
• Includes gap test + hermetic provision test. OUTPUT_FIELDS provisional until mise run discover.

Test plan

• Gap + hermetic tests in module
• Live mise run discover when provider is linked
• Merge after resolving additive registry.rs conflict with other family PRs

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Note

Low Risk
Additive integration and shared SDK helpers with offline tests; provisional output envelope may need discover before live provision.

Overview
Adds Prisma as a Phase 1 Stripe Projects catalog integration for prisma/database, so stacks can provision managed Postgres via provider = "prisma" and wire ${integrations.*.database_url}.

The adapter is a standard CatalogResource: required region, resource kind integration-prisma, and provisional OUTPUT_FIELDS until mise run discover. It registers in register_providers!, extends the catalog output drift test, and ships gap + hermetic provision tests.

SDK: stackless-provider-sdk gains optional/required boolean and optional integer config helpers for upcoming generated catalog modules.

Docs & tooling: New PROVIDER-WAVES.md and a catalog-first decision in DECISIONS.md; ADDING-A-PROVIDER.md links the wave protocol. Adds scripts/generate_catalog_integrations.py to scaffold remaining deployables (not run in this PR’s landed Rust tree beyond Prisma).

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