v3.1.0

3.1.0

• Updated dependencies for near-sdk
• Introduce trait IntoStorageKey and updating all persistent collections to take it instead of Vec<u8>.
  It's a non-breaking change.
• Introduce a macro derive BorshStorageKey that implements IntoStorageKey using borsh serialization. Example:

use near_sdk::BorshStorageKey;

#[derive(BorshSerialize, BorshStorageKey)]
enum StorageKey {
    Records,
    UniqueValues,
}

#[near_bindgen]
#[derive(BorshDeserialize, BorshSerialize, PanicOnDefault)]
pub struct StatusMessage {
    pub records: LookupMap<String, String>,
    pub unique_values: LookupSet<String>,
}

#[near_bindgen]
impl StatusMessage {
    #[init]
    pub fn new() -> Self {
        Self {
            records: LookupMap::new(StorageKey::Records),
            unique_values: LookupSet::new(StorageKey::UniqueValues),
        }
    }
}