fix: accept imageDownloadHeaders camelCase field name in search()

[mayuriphad]

Summary

SearchQuery.imageDownloadHeaders (components/marqo/src/marqo/tensor_search/models/api_models.py) is declared with alias="image_download_headers", and the docstring/validator comments make clear the intent is: imageDownloadHeaders is the current field name, image_download_headers is kept only as a deprecated alias for backwards compatibility.

But BaseMarqoModel.Config never sets allow_population_by_field_name. In pydantic v1, when a field has an alias, only the alias is accepted as input unless that flag is set — and combined with extra = "forbid", a request actually using the documented camelCase imageDownloadHeaders is rejected outright as an unrecognized field:

pydantic.v1.error_wrappers.ValidationError: 1 validation error for SearchQuery
imageDownloadHeaders
  extra fields not permitted (type=value_error.extra)

So today only the deprecated snake_case name works, which is backwards from the documented behavior.

Fix

Set allow_population_by_field_name = True on BaseMarqoModel.Config. This is the same pattern already used elsewhere in the codebase for exactly this kind of alias (base_model.py, recency_parameters.py), so it's consistent with existing convention. SearchQuery and BulkSearchQuery are the only classes built on BaseMarqoModel, and RecommendQuery (also built on it) declares no aliased fields, so this is scoped to the one place that needed it.

Fixes #401

Test plan

• Added test_image_download_headers_accepts_camel_case_field_name, asserting SearchQuery(imageDownloadHeaders=...) is accepted and correctly copied into mediaDownloadHeaders
• Verified the new test fails with exactly the reported extra fields not permitted error when the fix is reverted, and passes with it applied
• Full tests/unit_tests/marqo/tensor_search/models/test_api_models.py — 71 passed, 45 subtests passed (Python 3.11, per pyproject.toml's requires-python)

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