LDAP Ingestion not working for lower-case objectClass definitions (using FreeIPA, for example)

[nmartineznl]

Describe the bug
While executing LDAP ingestion using FreeIPA, groups are being dropped because objectClass values are in lower-case.
Users work because the objectClass value "person" does not contain any capital letter.

FreeIPA user class:
objectClass: posixgroup

LDAP code that processes users and groups:

                if (
                    b"inetOrgPerson" in attrs["objectClass"]
                    or b"posixAccount" in attrs["objectClass"]
                    or b"person" in attrs["objectClass"]
                ):
                    yield from self.handle_user(dn, attrs)
                elif (
                    b"posixGroup" in attrs["objectClass"]
                    or b"organizationalUnit" in attrs["objectClass"]
                    or b"groupOfNames" in attrs["objectClass"]
                    or b"group" in attrs["objectClass"]
                ):
                    yield from self.handle_group(dn, attrs)
                else:
                    self.report.report_dropped(dn)

To Reproduce
Steps to reproduce the behavior:

1. Configure LDAP ingestion as documented in https://datahubproject.io/docs/generated/ingestion/sources/ldap/
2. Configure FreeIPA as the LDAP server
3. Run the ingestion as documented in: https://datahubproject.io/docs/metadata-ingestion/cli-ingestion/
4. The report contains all groups in the dropped_dns list and groups are not created.

Expected behavior
The dropped_dns should be empty and groups should be created in DataHub.

[nmartineznl]

I belive that for both users and groups processing the comparisson should be case-insensitive