EPIC: openEO API v1.3.0 and openEO processes v2.0.0 (rc2) support

[soxofaan]

Epic ticket to group and cross-link the tasks on openeo python client related to upcoming release of

• openEO API v1.3.0: Release v1.3.0 openeo-api#582
• openEO processes v2.0.0 (RC2): Release v2.0.0-rc.2 openeo-processes#563