Audit fixes (#2922)

* oak-2

* oak-8

* oak-13

* oak-15

* oak-18

* Minor clippy nit

* 2023-01-13-OAK-6

* 2023-01-13-OAK-3

* 2023-01-13-OAK-13

Implemented via direct dependency on cw2 and calling the appropriate code on migration

* Removed few instances of password being unecessarily copied

* 2023-01-13-OAK-10

* 2023-01-13-OAK-12

* 2021-09-13-JP-S-NYM-02

* 2021-09-13-JP-S-NYM-03

* Removed further instances of needlessly copying the mnemonic

* 2021-09-13-JP-O-PROT-03

* 2021-09-13-JP-S-NYM-01*

*: we still have one vulnerability on 'time' pulled from chrono via sqlx. However, apparently its usage is fine... Having said that, I'd still recommend removing all dependencies on chrono, but this will require some database migrations...

* 2023-01-13-OAK-11 (#3009)

* wip

* Introducing the concept of starting epoch transition in `nym-api`

* split epoch operations into multiple files

* epoch operation failure recovery

* sending rewarding transactions in correct order

* tests and fixes due to epoch state progression

* lint

* missed rebasing import changes

* Setting cw2 contract version during first migration run

* calling 'reconcile_epoch_events' at least once

* Made message to BeginEpochTransition more consistent with other variants

* Merge layer assignment updates

---------

Co-authored-by: Jędrzej Stuczyński <jedrzej.stuczynski@gmail.com>

explorer-api/src/main.rs

@@ -4,7 +4,7 @@ extern crate rocket;
 extern crate rocket_okapi;
 
 use clap::Parser;
-use dotenv::dotenv;
+use dotenvy::dotenv;
 use log::info;
 use nym_bin_common::logging::setup_logging;
 use nym_network_defaults::setup_env;