Millennia ev laser

[takuya-ulm]

Description

• Bug fix
• Introduce VISA class and Command classes

Motivation and Context

• Some bugs were found in transition to the new core
• Even though the visa package was used in several laser hardware, it was not encapsulated.

How Has This Been Tested?

Tested with Millennia eV laser.
This hardware change does not have a big effect on the other area of the code.

Types of changes

• Bug fix
• New feature
• Breaking change (Causes existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• I have documented my changes in /docs/changelog.md.
• My change requires additional/updated documentation.
• I have updated the documentation accordingly.
• I have added/updated the config example for any module docstrings as necessary.
• I have checked that the change does not contain obvious errors
  (syntax, indentation, mutable default values, etc.).
• I have tested my changes using 'Load all modules' on the default dummy configuration.
• All changed Jupyter notebooks have been stripped of their output cells.