Introduce util functions to convert query and header record with the http:Query and the http:Header annotations

[TharmiganK]

Description:

$Subject

This is a requirement from the OpenAPI generated code, where we support adding http:Header and http:Query annotations in the generated record types for query and header. In the client class we are using remote methods and have separate util functions to convert headers and queries to the required representations:

• header record -> map<string|string[]>
• query record -> query string

This functions should consider the name attribute from the http:Header and http:Query annotations. Since we cannot access the annotations in the record fields in the ballerina side, we need to write conversion functions in Java. These functions are added in the HTTP package

Describe your task(s)

• Introduce a util function to convert a header record map to a map<string|string[]> with the names specified in the http:Header annotation (This function additionally does the conversion anydata -> string)
• Introduce a util function to convert a query record map to a map<anydata> with the names specified in the http:Query annotation (There is no value conversion in this method)

Related Issues (optional):
#6867