Merge "next" into "main" (V7)

[andreibancioiu]

mxpy v7 comes with an improved mini-testnet, now renamed to localnet. This is a breaking change - the previous set of commands for managing the mini-testnet (along with the adjacent TOML configuration) suffered a redesign. This change is accompanied by some other smaller breaking changes.

Please have a look on the migration support.

• https://github.com/multiversx/mx-sdk-py-cli/pull/239
• https://github.com/multiversx/mx-sdk-py-cli/pull/266
• https://github.com/multiversx/mx-sdk-py-cli/pull/252
• https://github.com/multiversx/mx-sdk-py-cli/pull/251
• https://github.com/multiversx/mx-sdk-py-cli/pull/250
• https://github.com/multiversx/mx-sdk-py-cli/pull/246