Fix: prevent warnings when importing decoder

[ricbir]

Currently, importing a decoder with format enabled causes warnings such as:

  console.warn
    unknown format "date" ignored in schema at path "#/definitions/User/properties/createdAt"

      at console.<anonymous> (node_modules/jest-mock/build/index.js:845:25)
      at unknownFormat (node_modules/ajv/lib/vocabularies/format/format.ts:84:23)
      at validateFormat (node_modules/ajv/lib/vocabularies/format/format.ts:75:9)
      at Object.code (node_modules/ajv/lib/vocabularies/format/format.ts:40:10)

This PR fixes that by flipping the order of addFormats and ajv.compile

[inluxc]

Please i need this PR resolve :(

Got lot of warning about this.

[inluxc]

@ricbir, can you fix the conflicts please?

[ssbarnea]

With @ricbir not responding, it might be wise to make another PR and get this annoying warning addressed.