Release Parquet format 2.7.0

[asfimport]

This is an umbrella issue for the 2.7.0 release. Please add any issues you'd like to get into that release as blockers.

Reporter: Fokko Driesprong / @Fokko Assignee: Fokko Driesprong / @Fokko

Related issues:

• Merge crypto spec and structures to format master (is blocked by)
• Define the parquet bloom filter statistics in parquet format (relates to)

PRs and other links:

• GitHub Pull Request #151

_{Note: This issue was originally created as PARQUET-1608. Please see the migration documentation for further details.}