Make Taskfile initialization less verbose by default

[HeCorr]

Fixes #2009.

When using the --init flag to create a new Taskfile, it currently prints the whole contents of the file to the terminal, which is unnecessarily verbose (and honestly seems to be unintentional).

This PR fixes it by only printing the filename by default and taking the --silent and --verbose flags into account to control the behavior:

$ task --init
Taskfile.yml created in the current directory

$ task --init --silent

$ task --init --verbose
# https://taskfile.dev

version: '3'

vars:
  GREETING: Hello, World!

tasks:
  default:
    cmds:
      - echo "{{.GREETING}}"
    silent: true

Taskfile.yml created in the current directory

Please note that I purposefully did not update the description of the --silent and --verbose flags so please let me know if you want me to and what should I change them to.

[HeCorr]

I'm considering making the Taskfile.yml created in the current directory text green to differentiate it from the file content output if it is present. Thoughts?

[pd93]

I really like this :) Changes seem fine to me. I don't think there is a huge need to update the flag descriptions for this. It should be fairly intuitive.

I do think we could update the Usage > Getting Started section to talk about --init though. We don't mention it anywhere on that page, despite being an intended starting point.

Not fussed if we do this here or in a separate PR.

[HeCorr]

We don't mention it anywhere on that page, despite being an intended starting point.

I did notice that and fully agree! I wouldn't really know how to write it though, so I prefer to leave it up to you guys.

[pd93]

No problem. I'm happy to add this later. Waiting for a second maintainer to review before we merge.