chore: replace merge-pr script with compiled version

[coriolinus]

https://github.com/wireapp/merge-pr

This includes prebuilt artifacts for macos and linux so that in the unlikely event that this gets popular, people can just fetch it without needing a rust toolchain or long build times.

Uses cargo-dist to create the CI, and cargo-release to do a release.

---

PR Submission Checklist for internal contributors

• The PR Title
  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[github-actions]

Bencher Report

Branch	prgn/chore/replace-merge-pr-with-compiled-version
Testbed	ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	milliseconds (ms)
Commit add f(group size)/cs1/mem/1002	📈 view plot 🚷 view threshold	18.64
Commit add f(group size)/cs1/mem/2	📈 view plot 🚷 view threshold	6.81
Commit add f(group size)/cs1/mem/202	📈 view plot 🚷 view threshold	9.38
Commit add f(group size)/cs1/mem/402	📈 view plot 🚷 view threshold	11.79
Commit add f(group size)/cs1/mem/602	📈 view plot 🚷 view threshold	14.68
Commit add f(group size)/cs1/mem/802	📈 view plot 🚷 view threshold	16.62
Commit add f(number clients)/cs1/mem/1002	📈 view plot 🚷 view threshold	1,002.50
Commit add f(number clients)/cs1/mem/2	📈 view plot 🚷 view threshold	6.82
Commit add f(number clients)/cs1/mem/202	📈 view plot 🚷 view threshold	85.51
Commit add f(number clients)/cs1/mem/402	📈 view plot 🚷 view threshold	223.91
Commit add f(number clients)/cs1/mem/602	📈 view plot 🚷 view threshold	431.10
Commit add f(number clients)/cs1/mem/802	📈 view plot 🚷 view threshold	678.89
Commit pending proposals f(group size)/cs1/mem/1002	📈 view plot 🚷 view threshold	115.71
Commit pending proposals f(group size)/cs1/mem/2	📈 view plot 🚷 view threshold	28.40
Commit pending proposals f(group size)/cs1/mem/202	📈 view plot 🚷 view threshold	45.99
Commit pending proposals f(group size)/cs1/mem/402	📈 view plot 🚷 view threshold	60.87
Commit pending proposals f(group size)/cs1/mem/602	📈 view plot 🚷 view threshold	79.22
Commit pending proposals f(group size)/cs1/mem/802	📈 view plot 🚷 view threshold	93.90
Commit pending proposals f(pending size)/cs1/mem/1	📈 view plot 🚷 view threshold	18.67
Commit pending proposals f(pending size)/cs1/mem/101	📈 view plot 🚷 view threshold	115.25
Commit pending proposals f(pending size)/cs1/mem/21	📈 view plot 🚷 view threshold	35.24
Commit pending proposals f(pending size)/cs1/mem/41	📈 view plot 🚷 view threshold	56.23
Commit pending proposals f(pending size)/cs1/mem/61	📈 view plot 🚷 view threshold	75.61
Commit pending proposals f(pending size)/cs1/mem/81	📈 view plot 🚷 view threshold	95.17
Commit remove f(group size)/cs1/mem/1002	📈 view plot 🚷 view threshold	27.70
Commit remove f(group size)/cs1/mem/2	📈 view plot 🚷 view threshold	6.74
Commit remove f(group size)/cs1/mem/202	📈 view plot 🚷 view threshold	8.96
Commit remove f(group size)/cs1/mem/402	📈 view plot 🚷 view threshold	11.73
Commit remove f(group size)/cs1/mem/602	📈 view plot 🚷 view threshold	17.16
Commit remove f(group size)/cs1/mem/802	📈 view plot 🚷 view threshold	21.71
Commit remove f(number clients)/cs1/mem/1002	📈 view plot 🚷 view threshold	29.62
Commit remove f(number clients)/cs1/mem/2	📈 view plot 🚷 view threshold	137.57
Commit remove f(number clients)/cs1/mem/202	📈 view plot 🚷 view threshold	115.16
Commit remove f(number clients)/cs1/mem/402	📈 view plot 🚷 view threshold	93.70
Commit remove f(number clients)/cs1/mem/602	📈 view plot 🚷 view threshold	71.53
Commit remove f(number clients)/cs1/mem/802	📈 view plot 🚷 view threshold	50.86
Commit update f(group size)/cs1/mem/1002	📈 view plot 🚷 view threshold	137.56
Commit update f(group size)/cs1/mem/2	📈 view plot 🚷 view threshold	6.96
Commit update f(group size)/cs1/mem/202	📈 view plot 🚷 view threshold	33.39
Commit update f(group size)/cs1/mem/402	📈 view plot 🚷 view threshold	59.63
Commit update f(group size)/cs1/mem/602	📈 view plot 🚷 view threshold	86.70
Commit update f(group size)/cs1/mem/802	📈 view plot 🚷 view threshold	112.11

🐰 View full continuous benchmarking report in Bencher