Add support for upgrading an installed tool when the requested version is newer.

AC:

• --upgrade and --ok-if-exists must be mutually exclusive
• the version compare must be semver, not string
• Details:
  • default (no flags): errors if tool exists
  • --ok-if-exists: skips if exists, exit 0
  • --upgrade: if exists and is installed lt requested -> download; else skip and exit 0
  • --force: always download/overwrite

It requires all tools to provide a version command/flag.
Blocked by arduino/arduino-language-server#196