Reduce python generated API file size

[ghost]

• Moved get_entity_path to entity_utils.hpp for C++
• Introduced get_absolute_path to get absolute path to entity when required
• Moved most of the generated ydk-python model API functions to static file py_types.py

[codecov]

Codecov Report

Merging #544 into master will decrease coverage by 0.56%.
The diff coverage is 86%.

@@            Coverage Diff             @@
##           master     #544      +/-   ##
==========================================
- Coverage   79.71%   79.15%   -0.57%     
==========================================
  Files          95       91       -4     
  Lines        9462     9276     -186     
  Branches     1244     1269      +25     
==========================================
- Hits         7543     7342     -201     
- Misses       1661     1675      +14     
- Partials      258      259       +1

Impacted Files	Coverage Δ
ydkgen/printer/__init__.py	100% <ø> (ø)	⬆️
ydkgen/printer/python/module_printer.py	81.13% <ø> (+6.13%)	⬆️
sdk/python/core/tests/test_sanity_delete.py	99.52% <ø> (ø)	⬆️
ydkgen/printer/python/class_printer.py	95.45% <ø> (+2.41%)	⬆️
ydkgen/builder/_api_model_builder.py	86.2% <0%> (ø)	⬆️
ydkgen/printer/cpp/class_members_printer.py	96.29% <100%> (+0.08%)	⬆️
ydkgen/printer/python/class_inits_printer.py	95.42% <100%> (-0.73%)	⬇️
ydkgen/printer/cpp/class_source_printer.py	98.43% <100%> (+0.03%)	⬆️
ydkgen/common.py	53.22% <100%> (+2.58%)	⬆️
sdk/python/core/ydk/entity_utils/__init__.py	100% <100%> (ø)	⬆️
... and 6 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #544 into master will decrease coverage by 0.55%.
The diff coverage is 87.57%.

@@            Coverage Diff             @@
##           master     #544      +/-   ##
==========================================
- Coverage   79.71%   79.15%   -0.56%     
==========================================
  Files          95       91       -4     
  Lines        9462     9275     -187     
  Branches     1244     1269      +25     
==========================================
- Hits         7543     7342     -201     
- Misses       1661     1674      +13     
- Partials      258      259       +1

Impacted Files	Coverage Δ
ydkgen/printer/__init__.py	100% <ø> (ø)	⬆️
sdk/python/core/tests/test_sanity_delete.py	99.52% <ø> (ø)	⬆️
ydkgen/builder/_api_model_builder.py	86.2% <0%> (ø)	⬆️
ydkgen/printer/python/module_printer.py	81.13% <100%> (+6.13%)	⬆️
ydkgen/printer/python/class_inits_printer.py	95.42% <100%> (-0.73%)	⬇️
ydkgen/printer/cpp/class_source_printer.py	98.43% <100%> (+0.03%)	⬆️
ydkgen/printer/python/class_printer.py	95.45% <100%> (+2.41%)	⬆️
sdk/python/core/ydk/entity_utils/__init__.py	100% <100%> (ø)	⬆️
ydkgen/common.py	53.22% <100%> (+2.58%)	⬆️
...dkgen/printer/cpp/class_get_entity_path_printer.py	82.97% <72.22%> (-13.38%)	⬇️
... and 6 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5105ef9...4b26d95. Read the comment docs.