Clean up redundant code for TiFlash

TiFlash fork from Clickhouse around late 2018. There are lots of useless codes for TiFlash.

• Remove StorageKafka, StorageMySQL, StorageODBC and CapnProtoRowInputStream https://github.com/pingcap/tics/pull/1279
• (Mainly) Remove documents for Clickhouse https://github.com/pingcap/tics/pull/1596
• Remove ReplicatedMergeTree family (TiFlash does not rely on those storage engines to do replication) https://github.com/pingcap/tics/pull/1805
• #3481
• #3484
• Automatically update related generated-cpp files after kvproto/tipb get updated https://github.com/pingcap/tics/pull/2110
• Remove some useless dependency for TiFlash.
  • kafka https://github.com/pingcap/tics/pull/2022
  • MongoDB, MySQL, odbc https://github.com/pingcap/tics/pull/2022
  • XML
    Clickhouse uses XML as the configuration file format but TiFlash uses toml. Seems that TiFlash do not rely on XML anymore.
  • Zookeeper https://github.com/pingcap/tics/pull/2253 https://github.com/pingcap/tics/pull/2255
    Clickhouse use zookeeper for replication, but TiFlash rely on PD and TiKV's Raft layer
• Remove Analyzers https://github.com/pingcap/tics/pull/2497 #2549
• #3485
• #3486
  These are outdated permission management, resource management from ClickHouse
• https://github.com/pingcap/tics/issues/3491

Something not sure:

• Remove redundant data types so that we don't need to instantiate some template class for these data types, which may greatly reduce our compile time
  • "DataTypeDate"/"DateTypeDateTime"
    We use "DataTypeMyDate"/"DataTypeMyDatetime" for MySQL/TiDB-compatibility, these original data types ported from Clickhouse are useless for TiFlash
  • "DataTypeTuple"/"DataTypeArray"/"DataTypeSet"
    We don't use these data type

Possible it is good for speeding up our CI building step #1390.

Start by reviewing the remaining unchecked items: the XML dependency, issue #3486, and redundant data types such as DataTypeDate, DataTypeDateTime, DataTypeTuple, DataTypeArray, and DataTypeSet. Confirm which are still used before removing them, and consider the impact on CI build time; done means the redundant code or dependencies are removed without breaking the build.