develop release notes:

Fix bugs and refactor code：
1. Avoid the retry efforts to consume too many CPU time in getting first available cache slot
2. Fix invalid free bug.
3. Fix sub/pub bug in returning data to client
4. Filter only sliding query.
5. Fix the crash when skey is less than ekey.
6. Fix bugs founded in regression test(reverse scan failed).
7. Fix __compar_fn_t build issue on Mac
8. Fix invalid write when assign the ip address at the client side.
9. Refactor code for sliding query processing
10. Refactor extbuffer model.
11. Refactor code for query intermeidate buffer.
12. Remove redundant codes
13. Fix bugs in regression test.
14. Fix query bugs.
15. Fix bugs found in regression test.
16. Modify default value of memory for aarch32 version
17. Modify compile scripts
18. Fix pHeader->tranId use the wrong method when assigning
19. Fix tpercentile link issue on Mac (and Windows)
20. Add description in the document: the time range that the database allows to insert records
21. Docker compile modify and doc modify
22. Refactor subscribe feature, and update corresponding documents
23. Modified the format of query result for Grafana plugin, seperate the data into divided arrays,
   one result array per table, with the tags as the label.
   Therefor "select * from super-table-name" will work well in the Grafana query.
24. Fix bug: describing super table causes crash, when add one tag and the data type of tag is wrong
25. Fix bug: the error result of show databases for no root user
26. Fix bug: Add additional check when super table uid is 0, Compatible with the case of super table with uid 0.
27. Fix a typo
28. Fix the crash when ctrl+c is triggered when querying super table.

New feature:
1. Add six new functions for supporting rate/irate/sum_rat/sum_irate/avg_rate/avg_irate