smart_charging: Handle profile updates per K01.FR.05

[christopher-davis-afs]

Describe your changes

Handles K01.FR.05. There are two open questions on this one:

• The spec doesn't specify whether or not it's valid to have a profile with the same id when one with a ChargingStationExternalConstraints already exists - just that ChargingStationExternalConstraints profiles can't be replaced. For this PR currently I assume it is, since the purpose is different and the main thing to avoid is having profiles with the same stackLevel and purpose at the same time.
• When the spec says to replace the profile, it doesn't make sense (to me) to replace a station-wide profile with an evse-specific profile. That said, the spec doesn't clarify that detail.

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• If OCPP 2.0.1: I have updated the OCPP 2.0.1 status document
• I read the contribution documentation and made sure that my changes meet its requirements

[couryrr-afs]

LGTM - ☕