[Oneshot Refactor] Rename get_shared_processor_src to get_processor_from_model

[horheynm]

SUMMARY:

• Rename get_shared_processor_src to get_processor_from_model
• Appropriate signature on initialize_processor_from_path, where teacher should be optinal

TEST PLAN:

• Pass all existing tests
• Search get_shared_processor_src using pygrep

  3 function pygrep() {
  2     local search_term="$1"
  1     shift
126     local search_dirs="${*:-src examples tests}"                           
  1     grep -rn --include="*.py" -E "$search_term" $search_dirs
  2 }

[github-actions]

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[kylesayrs]

lgtm, thank you for breaking this out

[horheynm]

lgtm, thank you for breaking this out

No problem, Its easier to review