Version flag implementation

[artis101]

• What kind of change does this PR introduce?
  New feature - CLI version flag: --version, -version, --v and -v

• What is the current behavior?
  Currently it does not exist. vim integrations are unable to determine version

• What is the new behavior?
  It returns version string like this:
  arduino-language-server git-snapshot (c3a0e49 2024-10-30) for git development version
  arduino-language-server 0.7.6 (c3a0e49 2024-10-30) for tagged releases
  arduino-language-server 0.0.0-git at the very minimum if all information is missing

• Other information:
  I added some rudimentary tests covering version.

func TestVersionInitialization(t *testing.T) {
	info := NewInfo("TestApp")
	if info.VersionString != defaultVersionString {
		t.Errorf("Expected default version '%s', got '%s'", defaultVersionString, info.VersionString)
	}
}

test like this is non-deterministic due to how task overrides environment variables and affects defaults. Perhaps I am overthinking. Please let me know what you think.

---