Existing timestamp bound read SQL syntax is over complicate and hard to use

[sunxiaoguang]

Feature Request

Is your feature request related to a problem? Please describe:
Existing timestamp bound read SQL syntax is verbose and complicate.

START TRANSACTION READ ONLY WITH TIMESTAMP BOUND
START TRANSACTION READ ONLY WITH TIMESTAMP BOUND STRONG
START TRANSACTION READ ONLY WITH TIMESTAMP BOUND MAX STALENESS '00:00:10'
START TRANSACTION READ ONLY WITH TIMESTAMP BOUND EXACT STALENESS '00:00:05'
START TRANSACTION READ ONLY WITH TIMESTAMP BOUND READ TIMESTAMP '2019-11-04 00:00:00'
START TRANSACTION READ ONLY WITH TIMESTAMP BOUND MIN READ TIMESTAMP '2019-11-04 00:00:00'
START TRANSACTION READ ONLY WITH TIMESTAMP BOUND MIN TIMESTAMP '2019-11-04 00:00:00'

Describe the feature you'd like:
Use a better syntax to staleness read and deprecates existing syntax.

[nolouch]

close this by #22765