Add maximum value validation for HNSW parameters

[Jeadie]

Changes

• Validate that HNSW parameters cannot be above set values.
  • For ef_construction, maximum can be set via environment variable MARQO_EF_CONSTRUCTION_MAXIMUM_VALUE.

Testing

• Unit tests
• Local test
• Upper limit testing

Local Test

export MARQO_EF_CONSTRUCTION_MAXIMUM_VALUE="2"

Ensure the following fails

client.create_index(index_name, settings_dict={
    "index_defaults": {
        "ann_parameters": {
            "name": "hnsw",
            "space_type": "l2",
            "engine": "lucene",
            "parameters": {
              "ef_construction": 3,
              "m": 50 # acceptable value
            }
        },
    },
    "number_of_shards": 1
})

Upper limit testing

• Create index with ef_construction
• Attempt to add 200 simple documents
• MARQO_EF_CONSTRUCTION_MAXIMUM_VALUE =10,000,000 is a safe upper bound

[pandu-k]

Can we keep the name of the variable and the value identical (in line with the other env vars?). It would be good to keep the pattern unless there's a pressing reason to change it

[pandu-k]

Also we can use MAX rather than MAXIMUM for conciseness

[Jeadie]

Oh sorry, I only saw the pattern on the RHS.