Confirm each near-cli action

[evgenykuzyakov]

Is your feature request related to a problem? Please describe.

Currently all transactions by near-shell are done without confirmations. With coming upgrades and renames, it's sometimes easy to mess up a transaction you want to do.

For example it's unclear how much gas near call will attach by default. Or whether the --amount is at NEAR tokens or yoctoNEAR.

Describe the solution you'd like

I suggest to display the transaction we want to send (before singing it) in a JSON format. It will be easy to inspect all fields visually. You can also check all default parameters and make sure they are legit.

Once satisfied with the result, near-shell should ask you to confirm the transaction with simple y/N question. Where N is default option.

You should be able to overwrite this confirmation by passing -y flag to the command.

Describe alternatives you've considered

Add -n flag that doesn't send a transaction, but only prints it.

[evgenykuzyakov]

Also once the transaction is signed. We can always link it to explorer, since we know the signer_id and the transaction hash.