FlashDB Versions Save

• Support 128bit write granularity for kvdb by @tinic
• Add kvdb inergrity check API.
• Add file access cache in file mode. The GC speed is up 2X.
• Improve the kvdb cache performance.
• Improve kvdb cache algo when key was first found. by @PostmanLinux
• Improve the FDB_ALIGN and FDB_ALIGN_DOWN by @DarryZh @guoweilkd

• add TSDB reverse iterator by @MikeTuev
• add partial GC function to reduce GC time for KVDB.
• add KVDB db size scale up feature
• add esp32 spi flash demo by @kaans
• add stm32l4 onchip FAL flash driver by @Spider84
• add support for flash with 0 after erasure, like TC397 onchip flash by @eternal-echo
• improve the TSDB testcases by @tangzhenye
• improve the KVDB testcases
• improve the CI auto test
• improve the sector iterator function, from oldest to latest by @shihang-zhang
• fix write fail as re-program flag at same addres for KVDB @weiguang-fan
• fix other bugs

• Update the FAL to latest version

• [tsdb] Fixed a bug (#108) when tsl is full on rollover mode.
• [tsdb] Improve exception handling.

• Add file storage mode. The database can be saved in filesystem.
• Add ESP8266 platform demo.
• Add linux platform demo.
• Add fdb_kvdb_deinit & fdb_tsdb_deinit function.
• Drop the append TSL when current time is less than last save time.
• Fix some bugs.

For more information, please view documents: https://armink.github.io/FlashDB/#/