Report version from git describe in metrics & CLI

[sandhose]

This reports the version from a git describe --tags --dirty in:

• the metrics, as a resource:

  target_info{os_type="macos",process_command_args="[\"mas-cli\"]",process_pid="35291",process_runtime_name="rust",process_runtime_version="1.83.0",service_name="mas-cli",service_version="v0.12.0-383-g168657cb2",telemetry_sdk_language="rust",telemetry_sdk_name="opentelemetry",telemetry_sdk_version="0.27.1"} 1
  

• by running mas-cli --version:

  $ mas-cli --version
  mas-cli v0.12.0-383-g168657cb2
  

• on startup in the logs:

  2024-12-12T16:37:00.317253Z  INFO cli.run.init: mas_cli::commands::server: crates/cli/src/commands/server.rs:63: Starting up version="v0.12.0-383-g168657cb2"
  

This adds a dependency on the git CLI at build time, which is probably fine. The alternative would be to use the gix crate which is pure-Rust, but this is probably overkill and would add many crates in the dependency tree.

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