feat: Add allowSpacesInSuggestions parameter to AutocompleteTrigger

[biongoo]

Description

This PR introduces a new parameter allowSpacesInSuggestions to the AutocompleteTrigger class. This allows the developer to choose whether the autocomplete suggestions can contain spaces or not.

For example, by setting allowSpacesInSuggestions to true, a trigger for '@' after typing '@john ' could even suggest results that include a space, like 'John Doe'.

The default behavior (i.e., without specifying allowSpacesInSuggestions or setting it to false) would be to return null as soon as a space is encountered after the trigger character, which means no suggestions are shown.

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.54 🎉

Comparison is base (6f6dc27) 82.70% compared to head (9d8a942) 83.24%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   82.70%   83.24%   +0.54%     
==========================================
  Files           3        3              
  Lines         185      191       +6     
==========================================
+ Hits          153      159       +6     
  Misses         32       32              

Impacted Files	Coverage Δ
lib/src/autocomplete_trigger.dart	100.00% <100.00%> (ø)

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[xsahil03x]

Hey @biongoo nice PR. Can you explain a bit more on the triggerSet? What are they and how are they being used?