prefix 'format_' for format related settings

[youngsofun]

background： I`m planning to add more format setting/option

pros:

1. compatible with clickhouse like https://clickhouse.com/docs/en/operations/settings/settings#json-formats-settings
2. they are only use din input/output format
3. make the meaning of setting name clear to user.
4. good to group them together when show settings.

cons:

1. longer name.
2. also apply to stream load, since it use settings.
3. have to remember to remove the 'format_' prefix when used in stage option

[youngsofun]

cc @Xuanwo @BohuTANG @sundy-li

[BohuTANG]

I am not sure about the background more, is this useful for the case(?):
https://docs.snowflake.com/en/sql-reference/sql/create-file-format.html

[youngsofun]

I think we will support create file format
but It should be syntactic sugar on top of a set of format option/setting.

[BohuTANG]

Ok, I missunderstand.

[Xuanwo]

I support this change.

[sundy-li]

+1

[BohuTANG]

Done #7960