[prettier-plugin-sql] [docs] indentStyle in sql-formatter is deprecated

[matiaskotlik]

The indentStyle option in sql-formatter is deprecated.

prettier-plugin-sql includes a parser option indentStyle which corresponds to the deprecated sql-formatter option. Maybe it should also be marked as deprecated, or at least documented in the README?

I am happy to write a PR if someone more familiar with the project can let me know what the preferred solution would be.

[JounQin]

It should add a deprecated: '0.19.2' into

prettier/packages/sql/src/index.ts

Line 302 in 802cb58

indentStyle: {

just like

prettier/packages/sql/src/index.ts

Line 299 in 802cb58

deprecated: '0.7.0',