Provide mapping to application/x-www-form-urlencoded when it has response and request body in resources

[lnash94]

Description:
Currently, the default mapping for map is application/json. Therefore, when generating OpenAPI for x-www-form-urlecnoded the service should be as follows. Basically we need to override the default content-type.

// this maps to x-www-form-urlencoded
service / on new http:Listener(9000) {
    resource function get foo(@http:Payload { mediaType: mime:APPLICATION_FORM_URLENCODED} map<string> keyvalue) 
            returns @http:Payload { mediaType: mime:APPLICATION_FORM_URLENCODED} map<string> {
        
    }
}

• RequestBody Mapping
• Response Mapping

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Related Issues (optional):
#1705

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