Use Shared CI Workflows

[rmartin16]

Implements shared workflows from beeware/.github#8

• pre-commit-run
• towncrier-run
• python-package-create

PR Checklist:

• All new features have been tested
• All new features have been documented
• I have read the CONTRIBUTING.md file
• I will abide by the code of conduct

[rmartin16]

@freakboy3742, just realized I didn't add dependabot.yml to this repo. do you want to add it?

version: 2
updates:
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      # Check for updates on Sunday, 8PM UTC
      interval: "weekly"
      day: "sunday"
      time: "20:00"

  - package-ecosystem: "pip"
    directory: "/"
    schedule:
      # Check for updates on Sunday, 8PM UTC
      interval: "weekly"
      day: "sunday"
      time: "20:00"