Release 3.1

* [Feature] Add junk_threshold for autolearn
* [Feature] Add neural test command
* [Feature] Antivirus: Allow to set fake eicar patterns for testing AV engines
* [Feature] Lua_cdb: Add cdb building interface
* [Feature] Ratelimit: Add per bucket configurations
* [Feature] S3: Allow to store structured data in messagepack
* [Fix] Add concept of uncancellable events to prevent use-after-free
* [Fix] Add temporary guard to prevent linked list exploitation
* [Fix] Another rework of the ucl hashing
* [Fix] Another try to fix references safety
* [Fix] Another try to fix rspamd_text passing in the selectors
* [Fix] Avoid copy for received structure as it has raw C pointers
* [Fix] Avoid dangling reference
* [Fix] Correctly check numeric URLs in URL DNS lists
* [Fix] Delete the correct pointer type
* [Fix] Dmarc: Always lowercase domain
* [Fix] Fix compilation of the hyperscan databases with errors
* [Fix] Fix hash table lookup
* [Fix] Fix http message flag shift
* [Fix] Fix parsing of the from_hostname when it is an IP address
* [Fix] Fix parsing of the unquoted attributes in HTML
* [Fix] Fix passing of rspamd_text in selectors pipelines
* [Fix] Fix rubbish QP sequences decoding
* [Fix] Fix some complicated case with the closing tags parsing
* [Fix] Fix the case when l tag is too small
* [Fix] Html: Fix the case where only bgcolor is explicitly set
* [Fix] Libucl: Fix deletion from ucl objects
* [Fix] Namespace and add metadata for OpenMetrics, fix interleaving
* [Fix] Plug memory leak in http settings reload
* [Fix] Preserve SPF top record in the mempool variable
* [Fix] Remove aarch64 GC64 workaround
* [Fix] Remove bogus G_LIKELY
* [Fix] Spf: Do not parse non TXT DNS replies as TXT replies
* [Fix] Try to use on_connect/on_disconnect callbacks to handle internal Redis failures
* [Fix] buffer overflow in rspamc counters
* [Fix] fix static building
* [Fix] lua_scanners - message_min_words logic
* [Fix] src/lua/lua_mimepart.c: fix null dereference
* [Project] Add constant iterators
* [Project] Add helper library to handle mime strings in a more safe matter
* [Project] Add preliminary support of CDB bayes dump
* [Project] Add trim operations
* [Project] Allow mempool allocated mime strings
* [Project] Cdb: Finish backend implementation
* [Project] Cdb: Fix configuration load
* [Project] Cdb: Use shared data between cdb statfiles
* [Project] Cdb: continue statistics backend implementation
* [Project] Finish received headers rework part
* [Project] Move C++ specific declarations to C++ header
* [Project] Rework received headers parsing to C++
* [Project] Start using of the new received structure
* [Project] Start work on cdb backend
* [Rework] Further rework of the redis pool
* [Rework] Redis_pool: fix issues found
* [Rework] Rework learn and add classify condition
* [Rework] Save invisible content to a separate buffer
* [Rework] Start rewriting of the redis pool logic
* [Rules] Improve zero font rule
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