[Format] Switch to long key ids in KEYs file

[asfimport]

PGP keys should be longer than 32bit, as outlined on https://evil32.com/. We should fix the KEYS file in parquet-format. I will push a PR shortly.

Reporter: Lars Volker / @lekv
Assignee: Lars Volker / @lekv

Related issues:

• [C++] Switch to long key ids in KEYs file (is a clone of)

PRs and other links:

• PR #61

_{Note: This issue was originally created as PARQUET-1076. Please see the migration documentation for further details.}

[asfimport]

Ryan Blue / @rdblue:
Merged #61. Thanks, @lekv!