feat(typesense): add whereNotIn filter to typesense engine

[tharropoulos]

Rationale

Currently, the Typesense driver doesn't process whereNotIn constraints in search queries, which limits the ability to exclude specific records from search results.

For example, when searching for products and wanting to exclude specific categories:

Product::search('laptop')->whereNotIn('category', ['refurbished', 'used'])->get();

This enhancement implements the missing whereNotIn functionality, allowing users to properly filter out unwanted results from their Typesense searches, making the search experience more flexible and precise.

Changes

Added Features:

1. New Methods in src/Engines/TypesenseEngine.php:
   • parseWhereNotInFilter(): Handles the conversion of whereNotIn constraints to
     Typesense filter syntax using !=[...] notation.

Code Changes:

1. In src/Engines/TypesenseEngine.php:
   • Enhanced filters() method to process whereNotIn constraints alongside
     existing where and whereIn filters
   • Improved filter concatenation logic to handle all filter types using collection
     methods
   • Updated filter string generation to maintain proper && operator placement

Test Updates:

1. In tests/Unit/TypesenseEngineTest.php:
   • Added new test method test_parse_where_not_in_filter_metheod() to verify
     whereNotIn filter generation
   • Enhanced test_filters_method() to include whereNotIn scenarios
   • Added test cases for both string and numeric value exclusions

Context

This PR addresses issue #876 reported by @alexfierro where whereNotIn constraints were
not being handled by the Typesense driver. The implementation follows the suggested
approach of adapting the existing whereIn logic with the appropriate Typesense
filter syntax for exclusions.

Before:

Product::search('laptop')->whereNotIn('category', ['refurbished']) // ❌ Ignored

After:

// Generates: category:!=[refurbished]
Product::search('laptop')->whereNotIn('category', ['refurbished']) // ✅ Works!