Create a tool to generate Ballerina types from XML schemas

[Nuvindu]

Description:
This is part of #6717

[Nuvindu]

The original plan was to create a WSDL tool that would generate Ballerina SOAP clients and record types from a WSDL specification. However, as part of this process, we decided to first create an XSD tool, which can generate Ballerina record types from an XSD schema.

This decision was also driven by a requirement from the solutions team, who needed support for generating records from XSDs.

[Nuvindu]

Relates to: ballerina-platform/ballerina-lang#41637

[Nuvindu]

It was decided to add this request as a product management issue and discuss it in the product council meeting for prioritization.