fix 1:#818 Master slave synchronization - There will be too many tuples problem

Cause:
Tianmu::dbhandler::TianmuHandler::current_position This variable is not initialized. In some cases,
a large value may cause too many tuples problem.
Solution: Initialize the variable

fix 2:#819 Master slave synchronization - Primary key conflict problem

Solution: Modify the modification logic of master slave synchronization, so that the delete and update operations do not follow the primary key logic

Supplement

sql/sql_insert.cc
Fix the problem that the insert statement will not generate binlog in the delayed insert mode
storage/tianmu/handler/tianmu_handler.cpp
Fix the binlog error of the line format generated by the tianmu engine

[summary]

NULL-->nullptr
namespace "DBHandler"-->"handler"
class TianmuHandler-->ha_tianmu
sdb-->tianmu
functions in ha_my_tianmu.cpp all renamed with prefix "ha_my_tianmu_xxx"

class member variable refactor：handler directory

Cause of the problem:
In the mode where the type is ref, the line number returned by the tianmu engine is 10 by default.
Modify Scheme:
Delete the logic that returns 10 rows by default, and return the number of rows in the table instead.

fix(handler): fix the bug for create table #mysql50#q.q should return failure and actually return success (#487)
	[summary]
	1.When creating a table in the tianmu engine, add code to determine whether the table name is empty.
	2.Add issue corresponding to mtr test case.

(1). implement tianmu's virtual function max_supported_key_part_length;
(2). enlarge max_supported_key_length's return value from 1024 to 16*1024;
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

feat(tianmu): Support (Single-Table Syntax) DELETE FROM tb_name add test cases for delete (#344) (#457)
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Co-authored-by: dfx <duanfuxiang>

This is a series of #11, which is used to improve the tianmu code quality.
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

[summary]
1. Change all engine stonedb to tianmu
2. Change SDB to tianmu
3. Also include mysql-test
4. Change file magic number to TianmuTB

This is subtask of #11, makes the stonedb clean code. Using meaningful
function names that make all users can read it literally.
The changes found in directories:
1: core
2: handler
3: loader
4: mm
5: vc
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

This is one of serial subtask of #11, which is used to improve stonedb source code quality.
The changes in directories as following:
1: core
2: handler
3: vc
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

This patch to fix up the compilation error: `NoAttrs` error. and also change `NoObj`, `NoDisplaybleAttrs`
We have changed
`NoAttrs` to `NumOfAttrs` and the files changed in directories as following:
1: stonedb/core
2: stonedb/handler
3: stonedb/loader
4: stonedb/vc
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* feat(stoned): To improve the code readbility, it's a subtask of (#11), #133
The changes in directories as following:
1: vc
2: core
3: handler
4: loader

* typo(.*): fix typos (#118)