Added vertical and horizontal gap limits

[Chsudeepta]

Description of work

Added fields to Jaws OPI to set the vertical and horizontal gap minimum limits.

Ticket

Ticket

Acceptance criteria

• The OPI changes should provide separate fields for setting the minimum limits for horizontal and vertical gaps
• The Jaws device screen should error out when vertical gap is less than minimum gap limit only when the direction of movement is reducing the gap from a previous higher value.
• The Jaws device screen should error out when horizontal gap is less than minimum gap limit only when the direction of movement is reducing the gap from a previous higher value.
• The corresponding motors should stop when minimum gap limits are violated.

Unit tests

The check_opi_format.py should be successful

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Code Review

• Is the code of an acceptable quality?
• If the change is to an OPI, does the check_opi_format.py script in C:\Instrument\Dev\ibex_gui\base\uk.ac.stfc.isis.ibex.opis pass?
• Do the changes function as described and is it robust?
• Is there associated PR for the release notes?

Final Steps

• Reviewer has also merged the release notes