feat: implement -v flag to print the version

[Manuel Vogel]

Expected Behavior

m1-terraform-provider-helper -v
v0.5.1

Actual Behavior

m1-terraform-provider-helper -v
Error: unknown shorthand flag: 'v' in -v
Usage:
...

Steps to Reproduce (including precondition)

m1-terraform-provider-helper -v

Your Environment

• OS: Darwin, arm64, 12.3.1
• m1-terraform-provider-helper version: v0.5.1
• see #40

[Martin]

-v is already used to provide a version for the install command, which is not ideal.
Maybe implement a version command?