Adding `contentEncoding` and `contentMediaType` to 3.1

[RobinTail]

Adding two new fields to the SchemaObject of 3.1. The contentEncoding is supposed to override the format (such as binary) for the case of file transfer. The contentMediaType is optional when defined as a key of ContentObject but it's JSON Schema compliant.

First appearance in 3.1.0 RC0: https://github.com/OAI/OpenAPI-Specification/releases/tag/3.1.0-rc0

Documentation: https://swagger.io/specification/?#considerations-for-file-uploads

[RobinTail]

The CI fails to run

> openapi3-ts-test@1.0.0 test:ts-esm
> ts-node --esm --project fixture/tsconfig.node.json index.ts

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /home/runner/work/openapi3-ts/openapi3-ts/test/index.ts
    at new NodeError (node:internal/errors:405:5)
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:136:11)
    at defaultGetFormat (node:internal/modules/esm/get_format:182:36)
    at defaultLoad (node:internal/modules/esm/load:101:20)
    at nextLoad (node:internal/modules/esm/hooks:864:28)
    at load (/home/runner/work/openapi3-ts/openapi3-ts/test/node_modules/ts-node/dist/child/child-loader.js:19:122)
    at nextLoad (node:internal/modules/esm/hooks:864:28)
    at Hooks.load (node:internal/modules/esm/hooks:447:26)
    at MessagePort.handleMessage (node:internal/modules/esm/worker:196:24)
    at [nodejs.internal.kHybridDispatch] (node:internal/event_target:786:20) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'

Consider switching to tsx

[RobinTail]

@pjmolina , please review. I tried to collect as much information about those fields as possible into the JSDOC. However, the PR is open for your edits.

[RobinTail]

Sure, @pjmolina , I can improve it accordingly.

[RobinTail]

Can we replace in full ts-node to use tsx? Just to avoid having 2 dependencies for the same task. Can you move these tools from the dependencies to dev-dependencies block as they are not needed for distribution?

All done, @pjmolina .

• ts-node removed from the test environment;
• Running tsx in CJS mode is ensured by the cts file extension;
• tsx moved to devDependencies.

[pjmolina]

Thanks @RobinTail Published in v. 4.2.0 https://www.npmjs.com/package/openapi3-ts?activeTab=versions