MINOR: [C++][ORC] Avoid signed overflow when converting timestamps

[jmestwa-coder]

A far-future ORC timestamp (after ~2262) makes AppendTimestampBatch in cpp/src/arrow/adapters/orc/util.cc overflow int64 nanoseconds in seconds * kOneSecondNanos + nanos. Reducing the multiply under -fsanitize=signed-integer-overflow:

runtime error: signed integer overflow:
  10000000000 * 1000000000 cannot be represented in type 'int64_t'

Detect it with MultiplyWithOverflow/AddWithOverflow and return Status::Invalid for out-of-range values.

[kou]

• Could you open an issue for non MINOR change? See https://github.com/apache/arrow/blob/main/CONTRIBUTING.md#Minor-Fixes for details.
• Could you use our PR template instead of removing it entirely?

[wgtmac]

I agree with @kou. Changes like this require an issue. The change itself looks good.