[GSK-3940] Make RagasMetric compatible with Ragas v0.2 #3983

Job	Run time
Python 3.9 on ubuntu-latest	19m 9s
Build and check doc	7m 0s
Python 3.10 on ubuntu-latest	19m 38s
Check if wheel can be installed with PDM	1m 12s
Python 3.11 on ubuntu-latest	17m 32s
Python 3.12 on ubuntu-latest	22m 4s
Check if wheel can be installed with pip	1m 0s
Python 3.10 on windows-2022	19m 41s
Check if wheel can be installed with using Poetry	1m 14s
Python 3.10 on macos-latest	11m 46s
Python 3.10 (Pydantic V1) on ubuntu-latest	20m 19s
Python 3.10 (Pandas V1) on ubuntu-latest	18m 16s
Python 3.10 (Minimal langchain) on ubuntu-latest	18m 14s
retry-on-failure	0s
	2h 57m 5s

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