[C#] Make GetValueOffset Obsolete

[asfimport]

BinaryArray.GetValueOffset and ListArray.GetValueOffset no longer have value.

We should add an Obsolete attribute to these methods in the next release, then remove these methods in the future release.

 

See this discussion: #6029 (comment)

Reporter: Takashi Hashida / @HashidaTKS

PRs and other links:

• GitHub Pull Request #6333

_{Note: This issue was originally created as ARROW-7514. Please see the migration documentation for further details.}

[asfimport]

Eric Erhardt / @eerhardt:
Issue resolved by pull request 6333
#6333