Use ProjectAPI API for Ballerina to OpenAPI Code generation

[lnash94]

Description:
We use a Syntax tree and Semantic Model for the code generation for the Current ballerina to the OpenAPI tool. Recently we have identified several scenarios in which we cannot achieve only using the Syntax tree and Semantic Model. Therefore we have to take ProjectAPI as well.
The issues we can not solve only using the Syntax tree and Semantic Model

1. Support @constraint annotation mapping for Ballerina to OpenAPI #5109
2. https://github.com/wso2-enterprise/internal-support-ballerina/issues/275

Meeting Notes that we discuss using projectAPI: https://docs.google.com/document/d/12qmNTOAZMvii0dFLcwcKh9JHZHnSn_ZeeZLjgJdZGjM/edit

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[NipunaRanasinghe]

Closing with ballerina-platform/openapi-tools#1209