Arrow parquet go is missing Power (ppc64le) specific utils implementations

[asfimport]

When trying to build the feast go lib on ppc64le it fails because parquet internal seems to miss even the basic (pure go implementations for ppc64le) files. Providing e.g. bit_packing_ppc64le.go & unpack_bool_ppc64le.go should solve this issue in the first place.

It can then be enhanced by implementing the correct vector & matrix intrinsics for the Power architecture (e.g. VSX or MMA) in a second step.

go build -mod=mod -buildmode=c-shared -tags cgo,ccalloc -o embedded_go.so .
cmd had error: exit status 2 output:
github.com/apache/arrow/go/v8/parquet/internal/utils
/root/go/pkg/mod/github.com/apache/arrow/go/v8@v8.0.0/parquet/internal/utils/bit_reader.go:230:18: undefined: unpack32
/root/go/pkg/mod/github.com/apache/arrow/go/v8@v8.0.0/parquet/internal/utils/bit_reader.go:274:3: undefined: BytesToBools
/root/go/pkg/mod/github.com/apache/arrow/go/v8@v8.0.0/parquet/internal/utils/bit_reader.go:318:18: undefined: unpack32 

I tested this already locally (with success) and create an according PR.

Environment: Linux (RHEL) ppc64le
Reporter: Marvin Giessing

PRs and other links:

• GitHub Pull Request #13840

_{Note: This issue was originally created as ARROW-17372. Please see the migration documentation for further details.}

[asfimport]

Matthew Topol / @zeroshade:
Issue resolved by pull request 13840
#13840