feat(shell): cache last autocomplete request

[Codelax]

Shell would spam request on each character change or cursor move

Example:

• instance server list name=| => request
• instance server list name=c| => request
• instance server list name=|c => request

Now request get cached
Example:

• instance server list name=| => request
• instance server list name=c|
• instance server list name=|c

[codecov-commenter]

Codecov Report

Merging #2846 (e1ca24c) into master (fd66ebe) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2846      +/-   ##
==========================================
- Coverage   74.80%   74.71%   -0.10%     
==========================================
  Files         142      142              
  Lines       28623    28658      +35     
==========================================
  Hits        21411    21411              
- Misses       6471     6506      +35     
  Partials      741      741              

Impacted Files	Coverage Δ
internal/core/shell.go	8.67% <0.00%> (-1.66%)	⬇️

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