feat(meilisearch): add the Meilisearch SDK

[Mkassabov]

This is the requested Meilisearch SDK from distilled#377.

Adds @distilled.cloud/meilisearch, generated from a first-party API description.

• Request: Request: Meilisearch #377
• Fetch script: stacks/distilled-submodules/spec-repos/meilisearch/fetch-specs.ts
• Spec source: https://www.meilisearch.com/docs/assets/open-api/meilisearch-openapi.json
• Convert/generate: packages/meilisearch/scripts/{convert,generate}.ts
• Mirror repo distilled-mirror/spec-mirror-meilisearch is created by the distilled-submodules stack on merge to main. Until then, regenerate with pnpm specs:local meilisearch and DISTILLED_SPECS_LOCAL=1 pnpm generate meilisearch.

pnpm specs:link meilisearch recorded the .gitmodules stanza (shallow = true).

Fixes #377