Surrealdb-orm: Implement chain query

[Oyelowo]

chain(query1)
   .chain(query2)
   .chain(query3);

[Oyelowo]

I've decided this is totally unnecessary convenience function and can introduce more confusion. There is already support for transactions and if you ever have to run multiple queries concurrently, just use tokio or whatnot and spin off each query asynchronously. The goal of this project is to stay as idiomatic as possible and not introduce cruft with no significant upsides.

[Oyelowo]

I take my word back. This may be useful e.g when you're using If else statement and you want multiple queries in a block or if youre doing schema definition and you just want to run all the queries without caring about the returned values