Code Injection Improvements

[gordonwatts]

Contains the following:

• Fixes a metadata capture bug that meant C++ functions were hidden by other forms of metadata in the request
• Added inject_code metadata block - it will allow you to insert code in all sorts of places. Implemented fro ATLAS only right now.
• the cpp function injection can now also work for methods

[codecov[bot]]

Codecov Report

Merging #190 (6223f9c) into master (a5f0ea6) will increase coverage by 0.05%. The diff coverage is 98.91%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   94.87%   94.92%   +0.05%     
==========================================
  Files          29       29              
  Lines        1638     1675      +37     
  Branches      271      278       +7     
==========================================
+ Hits         1554     1590      +36     
  Misses         54       54              
- Partials       30       31       +1     

Flag	Coverage Δ
unittests	94.92% <98.91%> (+0.05%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
func_adl_xAOD/common/meta_data.py	99.12% <96.66%> (-0.88%)	:arrow_down:
func_adl_xAOD/atlas/xaod/executor.py	100.00% <100.00%> (ø)
func_adl_xAOD/atlas/xaod/jets.py	100.00% <100.00%> (ø)
func_adl_xAOD/common/ast_to_cpp_translator.py	88.47% <100.00%> (ø)
func_adl_xAOD/common/cpp_ast.py	100.00% <100.00%> (ø)
func_adl_xAOD/common/executor.py	100.00% <100.00%> (ø)

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