Add OpenAPI spec and generated client

[vish-mv]

Purpose

Integrate the new Twitter (X) OpenAPI specification (Twitter API V2) by generating the client, types, and utilities for the updated API.

Changes

• Added the new Twitter (X) OpenAPI spec (Twitter API V2) to the project.
• Generated client code based on the new API specification.
• Generated type definitions for the updated API endpoints.
• Generated utility functions to support the new client and type definitions.

[NipunaRanasinghe]

we also need to add a sanitations.md file including all the sanitations we did on the original spec and, the exact command we used to generate the client using the openAPI tool. (A example PR with the expected file structures can be found in https://github.com/ballerina-platform/module-ballerinax-asana/pull/2/files)

[NipunaRanasinghe]

@vish-mv lets add the missing docs/license.txt file.