Document Q2 2025 releases

These are the new features in the Q2 2025 release batch. Please, make sure they're all either documented or doesn't need to be:

• MDEV-35850 make HOSTNAME a cmake configure variable
• MDEV-10164 Add support for TRIGGERS that fire on multiple events
• MDEV-12182 audit plugin should log HOST:PORT of incoming connection
• MDEV-14091 Support for passphrase protected keys
• MDEV-20034 Add support for the pre-defined weak SYS_REFCURSOR
• MDEV-20299 SET SESSION AUTHORIZATION
• MDEV-22491 Support mariadb-check and CHECK TABLE with SEQUENCE
• MDEV-27669 Not possible to check whether a server was started with skip-slave-start option
• MDEV-32732 Support DESC indexes in loose scan optimization
• MDEV-33834 Add tls_version field for connection audit plugins
• MDEV-34137 Implement the GIS function ST_Validate
• MDEV-34138 Implement the GIS function MBRCoveredBy
• MDEV-34141 Implement the GIS function ST_Simplify
• MDEV-34158 Implement the GIS function ST_GeoHash
• MDEV-34159 Implement the GIS function ST_LatFromGeoHash
• MDEV-34160 Implement the GIS function ST_LongFromGeoHash
• MDEV-34276 Implement the GIS function ST_IsValid
• MDEV-34277 Implement the GIS function ST_PointFromGeoHash
• MDEV-34278 Implement the GIS function ST_Collect
• MDEV-34712 Implement SHA2 support for file_key_management.so plugin (TDE)
• MDEV-34822 Skip FK checks in Galera during applying in IST
• MDEV-34860 Implement MAX_EXECUTION_TIME hint
• MDEV-34870 Implement join order hints
• MDEV-34888 Implement subquery optimizer hints
• MDEV-35504 MySQL 8-style optimizer hints: milestone 1
• MDEV-36099 Ensure that creation and usage of temporary tables in replication is predictable