Add version bump script

[balloob]

Description:

This adds a helper script to bump versions. Will help with both manual and the future automatic releases (beta only). Makes sure that version is higher in the version hierarchy than the previous version.

• script/bump_version.py dev: bump to the next dev version.
  • Convert 0.67.3 to 0.67.4.dev0
  • Convert 0.67.3.beta5 to 0.67.4.dev0
  • Convert 0.67.3.dev0 to 0.67.3.dev1
• script/bump_version.py beta: bump to the next beta version
  • Convert 0.67.5 to 0.67.8.beta0
  • Convert 0.67.0.dev0 to 0.67.0.beta0
  • Convert 0.67.5.beta4 to 0.67.5.beta5
• script/bump_version.py release_patch: bump to the next release patch version
  • Convert 0.67.3 to 0.67.4
  • Convert 0.67.3.beta5 to 0.67.3
  • Convert 0.67.3.dev0 to 0.67.3

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[balloob]

Merging this so I can use it for the rc release process.