Add Help Command to Makefile

[nueavv]

Proposal / RFE
Is your feature request related to a problem?

Currently, users lack an easy way to see the available commands in the Makefile, which can lead to confusion.

Describe the solution you'd like

I propose adding a help command to the Makefile that outputs the available commands along with their descriptions. This will help users quickly understand how to use the tool.

For example, the help command could display output like this:

Available commands:
  cilium            Build the Cilium binary.
  release           Create a release of the binary.
  local-release     Build binaries for local environment.
  install           Install the Cilium binary.
  clean             Remove the binary and release files.
  test              Run tests with race detection and coverage.
  bench             Run benchmarks.
  check             Run lint checks on the code.
  clean-tags        Remove generated tags and cscope files.
  tags              Generate tags for the source code.

Adding this feature will enhance the user experience and reduce confusion regarding command usage.