[Enhancement] UX-friendly context in `lotus-miner sectors extend`cmd

Checklist

[X] This is not brainstorming ideas. If you have an idea you'd like to discuss, please open a new discussion on the lotus forum and select the category as Ideas.
[X] I have a specific, actionable, and well motivated feature request to propose.

Lotus component

[ ] lotus daemon - chain sync
[ ] lotus fvm/fevm - Lotus FVM and FEVM interactions
[ ] lotus miner/worker - sealing
[ ] lotus miner - proving(WindowPoSt/WinningPoSt)
[ ] lotus JSON-RPC API
[ ] lotus message management (mpool)
[X] Other

What is the motivation behind this feature request? Is your feature request related to a problem? Please describe.

When a storage provider wants to extend the lifetime of a sector/sectors they need to use the lotus-miner sectors extend command.

Currently this command will simulate which sectors will be extended, but the command does not tell the user that they would need add the --really-do-it flag to actually send the message.

Current behaviour:

lotus-miner sectors extend
Extending 1 sectors:
 {
  "Extensions": [
    {
      "Deadline": 32,
      "Partition": 0,
      "Sectors": "81853",
      "NewExpiration": 4484712
    }
  ]
}
1 sectors extended

Describe the solution you'd like

When using the lotus-miner sectors extend we should make it clear that the --really-do-it flag needs to be passed to actually send the message, and give an estimate for how much the message will cost. Example:

lotus-miner sectors extend
Simulating extending 1 sectors:
 {
  "Extensions": [
    {
      "Deadline": 32,
      "Partition": 0,
      "Sectors": "81853",
      "NewExpiration": 4484712
    }
  ]
}
Simulating extending 1 sector - estimated costs xx.xxxFIL
You need to pass the --really-do-it flag to actully send the message

User story:

A storage provider should easily understand the next step to take when extending sector(s) through the CLI, and have a understanding of how much such a message would cost given the current baseFee.

Techincal scope:

Estimate how much the message will cost similar to lotus-miner sectors compact-partitions cmd: https://github.com/filecoin-project/lotus/blob/594c52b96537a8c8728389b446482a2d7ea5617c/cmd/lotus-miner/sectors.go#L2380-L2388
Print additional line explaining that the --really-do-it flag flag needs to be added to actually send the message when lotus-miner sectors extend is executed without it.

filecoin-project / lotus