feat: postgres arrays

[chesedo]

Allows generating and importing postgres arrays to close #171. Also covers array of json generation and json importing to close #67.

Things that don't work

• Generating array of Uuids: uuids end up as Value::String which cause them to be text here. Adding a Value::Uuid type should fix this, I will just need guidance about how please 😄
• Generating empty arrays don't work since they cannot be identified here. But generating an array with min length of 1 as a one_of null does work.
• Generating the postgres array of json type (json[]) does not work. Instead just using the simple postgres json type with an array in it ({[]}) does work - schema and generation definition

[christos-h]

LGTM in general. One question, why did you change the return type of:

fn try_match_value(row: &PgRow, column: &PgColumn) -> Result<serde_json::Value> 

from Value to serde_json::Value?

[chesedo]

@christoshadjiaslanis for json import support. The json object can be read by sqlx here inside try_match_value. I had no way to convert the serde_json::Value to Value and it seemed wasteful since it would be turned back to serde_json::Value eventually. So just went with serde_json::Value all the way.

[bmoxb]

very minor thing but otherwise looks good to me too :)

[chesedo]

Suggestion addressed, thanks @WiredSound 🥳

[bmoxb]

All looks good to me :)