(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)
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Co-authored-by: dfx <duanfuxiang>

This is a series of #11, which is used to improve the tianmu code quality.
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[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
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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
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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
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* 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)