Added clear function to autocomplete_entrylistbox

[preetiramaraj]

Added function to clear entry and clear listbox selection on function call.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.48%. Comparing base (ebaa7d4) to head (c5256c5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
- Coverage   89.53%   89.48%   -0.05%     
==========================================
  Files          43       43              
  Lines        4032     4024       -8     
==========================================
- Hits         3610     3601       -9     
- Misses        422      423       +1     

Files with missing lines	Coverage Δ
...kwidgets/autocomplete/autocomplete_entrylistbox.py	90.42% <100.00%> (+0.15%)	⬆️

... and 8 files with indirect coverage changes

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