Tomas Song

- Add `Warp` and `Cause` interface to save cause error. - Add `FastGenWithCause` to generate error with error code and cause error

remove duplicate error code check and add some public method

3

TiDB use same error code to represent a class of code, like `8200` contain a series of error related to unsupported ddl. When using this terror lib, TiDB will panic....

Add builtin function prototype `get_mvcc_info` in parser

4

## Feature Request This is sub issue of https://github.com/pingcap/tidb/issues/15938 **Is your feature request related to a problem? Please describe:** To implement getting mvcc info through SQL, TiDB need to support...