perf: centralised ajv validators for performance

[tim-hm]

Created from inline TODO.

It is likely that creating an Ajv instance on every request, and then loading formats and coercions, is costly. These ajv instances should probably be loaded as app bindings (src/env.ts) and then accessed via context.

Original location(s)

• nildb/src/common/validator.ts

  Line 33 in cce9e1c

  export function validateData<T>(

• nildb/src/common/validator.ts

  Line 9 in cce9e1c

  export function validateSchema(