[C++] Add casting implementations from strings to numbers or boolean

[asfimport]

Reporter: Wes McKinney / @wesm
Assignee: Licht Takeuchi / @Licht-T

Related issues:

• [C++] Type casting function kernel suite (Is contained by)

PRs and other links:

• GitHub Pull Request #1387
• GitHub Pull Request #2362

_{Note: This issue was originally created as ARROW-1491. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
While this would be nice, it's not immediately urgent. Some help would be appreciated

[asfimport]

Wes McKinney / @wesm:
@cpcloud this would be nice to have, but relative to the bug backlog for 0.9.0 we could also defer this to the next release

[asfimport]

Wes McKinney / @wesm:
Moving to 0.10.0

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 2362
#2362