Cluster metadata Validation

[Nivesh-01]

We validate wether the metadata has been propogated accross the cluster properly. We check the consistency accross different nodes in a cluster to see if everything is properly migrated.
This PR also has some changes related to #395 -> this is going to be merged into main and then in to fulltext but would be a blocking change hence added those same changes in this PR so that the testing can be comprehensive.

[BCathcart]

I'm going to push back a bit on the amount of tests and whether they all belong in the same file again.

First off, I'm not sure test_basic_text_index_metadata_validation is needed. I think just having test_complex_text_index_metadata_validation would be fine. I see that you're adding other field types in the complex test which I think is good because we don't seem to have a FT.CREATE integration test that already does this for the existing fields. Since we're testing the effects of FT.CREATE, I would consider moving it to the existing test_ft_create.py.

Next it looks like test_index_with_data_metadata_validation has good intentions to test that we can actually use the index cluster-wide. I'm not sure it's actually testing anything right now though. It just asserts that the indexes are in the ready state. I'd approach this more as an end-to-end sanity test where we create the index, ingest docs, and then do queries on them.

test_error_handling_metadata_validation tests invalid requests for FT.INFO and FT.CREATE. I'd check if these aren't already covered by any existing testing. From a quick glance it looks like there might already be coverage for FT.INFO in our integration tests and FT.CREATE in unit tests. If you see gaps in the invalid FT.CREATE command coverage, I'd add additional unit tests to ft_create_test.cc

[BCathcart]

Looks good overall. Let's meet tomorrow afternoon and clean up these last few small things.

[BCathcart]

Let's add get_ft_list() to IndexingTestHelper and then get_ft_list_from_all_nodes and get_ft_info_from_all_nodes aren't really needed