v4.0.0

Optimization v4.0.0

Diff since v3.28.0

Merged pull requests:

• [WIP] Updates for OptimizationBase v2 (#789) (@Vaibhavdixit02)
• Add constraints support for NLopt (#799) (@Vaibhavdixit02)
• Add constraints support for NOMAD (#817) (@Vaibhavdixit02)
• Bump versions (#818) (@Vaibhavdixit02)
• docs updates (#819) (@Vaibhavdixit02)