Metadata - Add 'readonly' to id fields, custom fields & contact fields

[colemanw]

Overview

Adds 'readonly' metadata to all id fields, custom fields with 'is_view' and appropriate contact fields.

See https://lab.civicrm.org/dev/core/-/issues/2397

Before

Schema had no way to identify fields as 'readonly'.

After

Now it does.

Technical Details

For core fields, applies to primaryKey fields and fields tagged <readonly>.
For custom fields, this comes through via the 'is_view' property.

This will help autogenerated forms to know whether a field is appropriate to show to the user.

[civibot]

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[seamuslee001]

This seems to be ok to me and the premise makes sense, I would also add this is adding a piece of new metadata to the DAOs and there for apiv3 is not impacted nor the standard DAO functionality and unit tests have passed so merging