Add confidence enumerated values to floating points

[adamlm]

PR Details

Description

This PR adds some convenience functions to convert the SAE confidence enumerated values to floating point equivalents. The enumerated values aren't really useful beyond standardizing data representation in messages.

Related GitHub Issue

Related Jira Key

Closes CDAR-734

Motivation and Context

Need the confidence values to generate covariance matrices. Floating point representations help with this.

How Has This Been Tested?

Unit tests.

Types of changes

• [x] New feature (non-breaking change that adds functionality)

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.