Some field storage column settings should be conditional

Problem/Motivation

Some settings like max_length for example are not applicable and can trigger validation restrictions when they shouldn't. As in the case of a URI or Link field type, those max_lengths are hardcoded and shouldn't be validated against the default.

Additionally, some of the schema types for custom_field.column are incorrect.

Steps to reproduce

Add a URI or Link field in storage settings and notice that the max_length of those types is not accounted for and assumes a limit of default 255 which can trigger a validation error that can't be fixed in the UI.

Proposed resolution

• Make storage settings fields conditional based on data type and modify the getCustomFieldItems() method to account for those settings conditionally.
• Update schema for custom_field.column to correct types.
• Update any api helpers to account for NULL for those gets.