[C++] Add GetSpan to ArrayData

[pitrou]

Describe the enhancement requested

ArraySpan has a GetSpan convenience method, but ArrayData hasn't. We should probably add one (perhaps as a GetSpan/GetMutableSpan pair).

Component(s)

C++

[pitrou]

cc @tadeja

[Shally-Katariya]

Hi @pitrou, I'd like to work on this issue

[pitrou]

Feel free to do it, but don't overwork yourself :)

[Shally-Katariya]

@pitrou Sure, will keep that in mind :)

[VedantRalekar]

Hi @pitrou, I'd like to work on this issue

[pitrou]

@VedantRalekar Feel free to start working on it and submit a PR!

[pitrou]

Issue resolved by pull request 50366
#50366