feat: support paths/URLs in any prompt, refactored entrypoint to call a new public API with core logic

[ErikBjare]

WIP #35

The goal is to have:

• gptme.chat()
  • which can be called with no arguments to start a new conversation
  • return something meaningful
  • be used to run a batch job

also:

• added support for reading paths anywhere in prompt (fixes Support file paths in prompts after the first message #38)
  • No more forgetting to include a path in the initial prompt

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (7160b97) 80.48% compared to head (d16eaa2) 81.20%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
gptme/cli.py	90.74%	5 Missing ⚠️
gptme/cli_server.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   80.48%   81.20%   +0.71%     
==========================================
  Files          25       25              
  Lines        1696     1729      +33     
==========================================
+ Hits         1365     1404      +39     
+ Misses        331      325       -6     

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