loam-soroban-sdk

Wrapper around Soroban SDK which adds features needed by Loam SDK, such as:

• lazy getting and setting
• implementation of Loam'sIntoKey derive macro that relies on Soroban SDK's specifics
• abstraction of Soroban SDK's env to enable Loam SDK-authored contracts to avoid referencing it at all and use Rust's standard mutable/immutable method definition syntax (my_method(&self, ...) vs my_method(&mut self, ...)).