Path api refactor

[ylil93]

• parent() --> get_parent()
• children() --> get_children()
• root() --> get_root()
• path() --> get_path()
• statement() --> get_statement()
• keys() --> get_keys()
• create() --> create_datanode()
• rpc() --> create_rpc()
• schema() --> get_schema_node()
• set() --> set_value()
• get() --> get_value()
• input() --> get_input_node()

[codecov-io]

Codecov Report

Merging #494 into new_python will not change coverage.
The diff coverage is 96%.

@@             Coverage Diff             @@
##           new_python     #494   +/-   ##
===========================================
  Coverage       67.44%   67.44%           
===========================================
  Files              98       98           
  Lines           15208    15208           
  Branches         2439     2439           
===========================================
  Hits            10257    10257           
  Misses           4281     4281           
  Partials          670      670

Impacted Files	Coverage Δ
sdk/python/core/tests/test_sanity_path.py	97.5% <100%> (ø)	⬆️
sdk/python/core/tests/test_restconf_provider.py	98.07% <100%> (ø)	⬆️
sdk/python/core/ydk/services/codec_service.py	91.15% <50%> (ø)	⬆️

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