Please check if the PR fulfills these requirements
[x] The commit message follows our guidelines
[x] Tests for the changes have been added (for bug fixes / features)
[ ] Docs have been added / updated (for bug fixes / features)
Does this PR already have an issue describing the problem?
No
What kind of change does this PR introduce?
Refactoring
What is the current behavior?
DataframeContext has been added to low level dataframe API but has some data specific to network.
What is the new behavior (if this is a feature change)?
DataframeContext is implemented as a generic type in the low level API and a specific class NetworkDataframeContext is added to network dataframe package.
Does this PR introduce a breaking change or deprecate an API?
[ ] Yes
[ ] No
If yes, please check if the following requirements are fulfilled
[ ] The Breaking Change or Deprecated label has been added
[ ] The migration steps are described in the following section
What changes might users need to make in their application due to this PR? (migration steps)
Please check if the PR fulfills these requirements
Does this PR already have an issue describing the problem?
No
What kind of change does this PR introduce?
Refactoring
What is the current behavior?
DataframeContext has been added to low level dataframe API but has some data specific to network.
What is the new behavior (if this is a feature change)? DataframeContext is implemented as a generic type in the low level API and a specific class NetworkDataframeContext is added to network dataframe package.
Does this PR introduce a breaking change or deprecate an API?
If yes, please check if the following requirements are fulfilled
What changes might users need to make in their application due to this PR? (migration steps)
Other information: