Release v0.15.0

What's Changed

• Allow fork to a queue to specify a partition key by @maxdml in #306
• Bulk cancels by @maxdml in #307
• Workflow communications observability by @maxdml in #308
• Allow tagging a DBOS process with metadata by @maxdml in #309
• Workflow aggregates by @maxdml in #311
• application versions management by @maxdml in #313
• Partial indexes by @maxdml in #315

Full Changelog: v0.14.0...v0.15.0