Add Ballerina type/field/parameter name generation support from the Ballerina name extension

[TharmiganK]

Description:

With this proposal, the OpenAPI specification can be sanitized with Ballerina friendly names and a Ballerina name extension(x-ballerina-name) has been introduced in order to generate Ballerina type/field/parameter names as specified in this extension rather than the actual name.

Describe your task(s)

• [x] Add support in the record field name generation
• [x] Add support in the type name generation
• [x] Add support in the parameter name generation