* libcxxabi uses exception handling library as public
* Don't set -stdlib for internal libc++ - it poisons the checks.
* Enable capnproto in unbundled build back

Fix bad size of marks with skip indices

Fallback from O_DIRECT.

Improve error handling in cache dictionaries

Reduced children_mutex lock scope in IBlockInputStream

allow using expired values while the source of a cache dictionary doesn't respond;
clone the source after an error to reset connections;
don't ask the source for a little time after error;
show the last exception in system.dictionaries for a cache dictionary too.

This is to fix TSan warning 'lock-order-inversion'.
Thread locks IBlockInputStream::children_mutex (A) and then subsequently locks
MergeTreeDataPart::columns_lock mutex (B), holding it for extended period of
time, surviving the unlock of the A. Then, while B is still locked, A
is locked again, causing a TSan warning.

Remove mimalloc

* Print better offsets on commit
* Stop consumption on the read buffer level
* Don't use cancellation in the middle of copyData()
* Add test
* Disable squashing stream for Kafka materialized views
* Commit last read message, since rdkafka auto-modifies offset

Fix for data race in StorageMerge

Fix extracting a Tuple from JSON

Fix build with internal libc++

Fix segmentation fault in vertical merge with skip indices

* Fix shared build
* Major default libs refactor
* Fix build with gcc_eh
* Link all libraries as a big group.
* Use global interface library as a group
* Build capnproto using our cmake
* Use only internal libunwind

Test for #4858