feat(range): add reference point for start position of range slider

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Developers are unable to specify a start position of the range bar. This prevents developers from having experiences where the start position may be fixed at "0", but have a min value of less than zero and a maximum value higher than zero.

For example, this is not possible:

Issue URL: #24348

What is the new behavior?

• Introduces barActiveStart property to enable developers to set the position the bar will begin from in the range slider (only available in single knob)

Does this introduce a breaking change?

• Yes
• No

Other information

This PR is in favor of #24399, will give co-authored-by credit when merging.

[sean-perkins]

Not sure why the accordion screenshot has a diff... going to add a task for that in our backlog and see if another run of updating the reference screenshots resolves it.

[liamdebeasi]

According to the design doc, "If [the floor value] falls outside [max and min], a console warning will be logged for the developer and floor will fall back to the min value specified."

The warning is there, but the floor does not fall back to the min value.

Example:

<ion-range
  class="ion-no-padding"
  min="-100"
  max="100"
  snaps="10"
  step="10"
  pin="true"
  bar-active-start="1000"
  value="0"
>
</ion-range>

[liamdebeasi]

Great job! Good to go once my remaining comment has been addressed.