test: shardddl tests not implemented

[GMHDBJD]

Feature Request

Is your feature request related to a problem? Please describe:

This issure list all tests that currently not implement in #723

Describe the feature you'd like:

implement after we support the cases.

Describe alternatives you've considered:

• TiDB 相关等
  • 24 25, 变更 table routing 规则（暂时不支持）
  • 42 43 44 45, 生成列和自增列(TiDB暂时不支持alter语句增加store生成列和删除自增列)
  • 52 53 54 55, chang column (MySQL 中 change 等同于 rename，已在49-51中覆盖)
  • 60 61 69 70 71 72 73 74 75, modify charset(TiDB 暂时不支持 modify charset, DM 内的 schema comparer 也暂不能正确比较 charset 间的兼容关系)
  • 83 84, 变更外键 (暂时不支持)
  • 86 ,alter index (schema compare 还不能处理 visible/invisible)
  • 87 88 89 90, worker数量，下游数据库异常(已在其它case中覆盖)
  • 91, 触发器(TiDB 暂时不支持触发器)
  • 92 93, chaos (未测试)
• sharding mode等
  • 029 078 079, alter-primary-key开启，变更主键 (schemaTracker 报错)
  • 32 (pessimistic) 添加列后删除再添加
  • 33 (optimistic) 添加 not null 的列
  • 35 (pessimistic) 添加列时 DDL 顺序不同
  • 36 (pessimistic) 添加列的顺序不同
  • 38 (optimistic) 增加的列 default 值不固定(ASAP)
  • 56 (pessimistic,optimistic) change column 修改列顺序
  • 57 (optimistic) change column 设置 default 值相同
  • 63 (optimistic) modify column smallint/bigint
  • 80 (optimistic) 添加多个索引
  • 81 (optimistic) 删除多个索引
  • 82 (optimistic) 进行 rename 索引操作

Teachability, Documentation, Adoption, Migration Strategy: