Add segment reporter

[csweichel]

Description

This PR adds a Segment reporter to Leeway. This reporter helps us track the performance/efficiency of our build setup. To use it, use --report-segment=<WRITE_KEY> or the LEEWAY_SEGMENT_KEY env var. The latter is particularly useful for enabling this feature in GitHub actions.

The reporter produces the following events:

• A track event when a package build finishes:

  {
      "anonymousId": "391edb6c-891d-454a-b0e3-07f572b5f71d",
      "event": "package_build_finished",
      "timestamp": "2023-07-02T12:43:14.344840785Z",
      "context": {
          "app": {
              "name": "leeway",
              "version": "unkown"
          },
          "os": {
              "name": "linux"
          }
      },
      "properties": {
          "commit": "f122bad8ed63f11505d09f1255db46fefad1e96b",
          "dirtyWorkingCopy": false,
          "durationMS": 2453,
          "lastPhase": "build",
          "name": "//:app",
          "repo": "https://github.com/gitpod-io/leeway.git",
          "success": true
      }
  }

In addition, this PR adds "build phases" which provide more fine-grained feedback of the build progress and failure modes. These are the build phases, executed in this order:

• prep
• pull
• lint
• test
• build
• package

[codecov]

Codecov Report

Merging #157 (a673d62) into main (3bad410) will decrease coverage by 0.19%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##            main    #157      +/-   ##
========================================
- Coverage   8.58%   8.39%   -0.19%     
========================================
  Files         20      20              
  Lines       3320    3394      +74     
========================================
  Hits         285     285              
- Misses      2983    3057      +74     
  Partials      52      52