Non-compiling code is generated for go-clients for deep object query-parameters

Recently there was a deep object query-parameter added to the commercetools-api-reference.

See **filter[attributes]** in file **attribute-filtering.raml** -> https://github.com/commercetools/commercetools-api-reference/blob/main/api-specs/api/traits/attribute-filtering.raml

This feature cannot be handled by rmf-codegen for go clients. It generates non-compiling code. **Filter[attributes]** is not a valid function name.

`func (rb *ByProjectKeyInStoreKeyByStoreKeyProductProjectionsByIDRequestMethodGet) Filter[attributes](v []string) *ByProjectKeyInStoreKeyByStoreKeyProductProjectionsByIDRequestMethodGet {
if (rb.params == nil) { rb.params = &ByProjectKeyInStoreKeyByStoreKeyProductProjectionsByIDRequestMethodGetInput{} }
rb.params.Filter[attributes] = v
return rb
}`