Improve schemeshard operations build time

[ijon]

Compiling schemeshard and schemeshard operations takes significant amount of time.
(8394 seconds, which is 2.5 hours on a single core or 8.7 minutes on a 16 cores)

TODO...

• schemeshard_impl.h -- split operations iface into schemeshard__operation_iface.h
• schemeshard_impl.h -- remove use by operations
• get rid of static_cast to TSchemeShard* in operations code
• move static methods out of TSchemeShard (into some lib/utils module)
• localdb.h -- remove header dependency on flat_scheme_op.proto
• schemeshard_tx_infly.h -- remove dependency on flat_scheme_op.proto and flat_tx_scheme.proto
• schemeshard_identifiers.h -- remove dependency on flat_scheme_op.proto
• schemeshard__operation_memory_changes.h -- make clean interface without leaking specific types
• schemeshard_info_types.h -- separate different types into separate files
• schemeshard__operation_side_effects.h -- make clean interface without leaking specific types
• schemeshard__operation_db_changes.h -- also clean from specific types
• schemeshard.h, schemeshard_private.h -- separate event interface into client, core, operations etc interfaces and include relevant parts only where necessary
• schemeshard__operation_common.h -- remove dependency on ydb/core/base/hive.h
• schemeshard__operation_common.h -- remove dependency on schemeshard_private.h
• schemeshard_utils.h -- clean up from schemeshard.h and other hard headers inclusion, may be dismantle even
• break ydb/core/base dependency on flat_scheme_op.proto
• move TShardDeleter out of schemeshard_utils.h
• make anything coming from schemeshard__operation_iface.h forward declared
• move TCompactionPolicy from flat_scheme_op.proto to some core .proto
• and completely replace TCompactionPolicy with something else to use in public api -- current specification is unusable for that
• tests -- reduce influence of a single change on single ut_-module rebuild time
• etc

---

• build_bloat: add paths sorting to improve visual stability #10604
• base: move TCompactionPolicy out of flat_scheme_op.proto #10495
• schemeshard: split schemeshard__operation_common.cpp, move code from .h #10631