Fix network types

[ikrivosheev]

PR Info

Query example:

let addr = Ipv4Network::new(Ipv4Addr::new(127, 0, 0, 1), 8);
let query = Query::select()
        .column(Network::Ip)
        .from(Network::Table)
        .and_where(Expr::col(Network::Ip).eq(addr))
        .to_string(PostgresQueryBuilder),

println!("{}", query);
// Before: SELECT "ip" FROM "network" WHERE "ip" = 127.0.0.1/8 - ERROR!
// After: SELECT "ip" FROM "network" WHERE "ip" = '127.0.0.1/8' - OK

Fixes

• Fix network types convert to string
• Remove unneeded escape character

[tyt2y3]

Thank you!