Use new lazy_import function to lazily import third-party libraries

[abrookins]

Uses the new lazy_import utility from: #330

[Copilot]

Pull Request Overview

This pull request updates various modules to use the new lazy_import utility for third-party libraries, streamlining imports and potentially reducing startup overhead. Key changes include switching direct imports of numpy, nltk, tabulate, and ml_dtypes to lazy imports across multiple files and adjusting the test setup for bfloat16 handling.

• Migrate direct module imports to lazy_import where applicable
• Update various utility functions and CLI components to adopt lazy imports
• Adjust testing code to handle special cases for bfloat16 imports

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/unit/test_utils.py	Adjusted handling for bfloat16 testing with explicit ml_dtypes import
redisvl/utils/optimize/utils.py	Replaced numpy import with lazy_import
redisvl/utils/optimize/router.py	Replaced numpy import with lazy_import
redisvl/utils/optimize/cache.py	Replaced numpy import with lazy_import
redisvl/redis/utils.py	Migrated numpy and ml_dtypes import to lazy_import at module level, but retains explicit import for bfloat16 in utility functions
redisvl/query/query.py & aggregate.py	Replaced nltk and its stopwords import with lazy_import
redisvl/cli/stats.py & index.py	Updated tabulate import to lazy_import

[tylerhutcherson]

LGTM beyond what the copilot is asking and my note about the helper function we have.