ticdc openapi does not validate Chinese characters for parameter sink.csv.delimiter.

[cchenkey]

What did you do?

use ticdc changefeed openapi update changefeed，when specify parameter sink.csv.delimiter Chinese characters，cdc server also accept it

What did you expect to see?

for doc，cdc server will refuse the update requet for it is not an ASCII characters

What did you see instead?

cdc server also accept ther request，i dont know whether it makes work

Versions of the cluster

Upstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

(paste TiDB cluster version here)

Upstream TiKV version (execute tikv-server --version):

(paste TiKV version here)

TiCDC version (execute cdc version):

v7.2.0，maybe all versions do not check it

[nongfushanquan]

/assign @CharlesCheung96

[fubinzh]

/severity moderate