DOCSUP-6113: Document the Atomic database engine

DOCSUP-7575: Edit and translate to Russian

Fix flaky test after #22427

Fix CPU-dependent behaviour in tests

Fix assert in Arena when doing GROUP BY Array of Nothing of non-zero size.

Allow building with unbundled xz

ClickHouseDictionarySource loop fix

Make round function to behave consistently on non-x86_64

Allow query profiling only on x86_64

AppleClang compilation fix

Minor fixes in tests for AArch64

Filter removed/renamed tests from ci-changed-files.txt for fuzzer

Fix UB by unlocking the rwlock of the TinyLog from the same thread

Before this patch the build with libstdc++ hangs for
00967_insert_into_distributed_different_types test (and I guess some
others), this is because the rwlock is acquired from different thread as
it was unlocked which causes UB [1], fix this by moving unlock into
writeSuffix().

  [1]: The pthread_rwlock_unlock() function shall release a lock held on
       the read-write lock object referenced by rwlock. Results are undefined
       if the read-write lock rwlock is not held by the **calling thread**.

Try fix flaky test

Convert right block to full in MergeJoin

Fix deserialization of empty string without newline at end of TSV format

FormatSettings null_as_default default value fix

Follow up to #19516

Do not limit HTTP chunk size