auth: add the caching sha2 algorithm for authentication (pingcap#1232)

This allows validating passwords against the `authentication_string`
data that MySQL stores for caching_sha2 passwords.

Related:
- pingcap/tidb#9411

Add Admin Telemetry Statement (pingcap#908) (pingcap#909)

Signed-off-by: Breezewish <me@breeswish.org>

model: correct the usage of json.Unmarshal in DecodeArgs (pingcap#890) (

pingcap#896)

parser: support partition selection grammer for the delete statement (p…

…ingcap#868) (pingcap#870)

parser: support partition selection grammer for the delete statement (p…

…ingcap#868) (pingcap#870)

parser: add order by clause in group_concat (pingcap#813) (pingcap#847)

lexer: replace version comments with feature-ids mechanism (pingcap#777…

…) (pingcap#838)

parser: introduce a new privilege for the `set config` statement (pin…

…gcap#835)

parser: add auto_random_base table option (pingcap#830)

parser: add auto_random_base table option (pingcap#830)