Improve SVG Image field type name and description on "Add Field" form

Problem/Motivation

Description for "File" field:

• For uploading files
• Can be configured with options such as allowed file extensions and maximum upload size

Description for "Image" field:

• For uploading images
• Allows a user to upload an image with configurable extensions, image dimensions, upload size
  Can be configured with options such as allowed file extensions, maximum upload size and image dimensions minimums/maximums

Description for "Svg Image" field:

This field stores the ID of an image file as an integer value.

Steps to reproduce

• Install Drupal with "Standard" install profile.
• Enable Svg Image Field module.
• Click "File upload" to add an Svg Image field to the Article content type at URL /admin/structure/types/manage/article/fields/add-field
• Compare types and description text

Proposed resolution

• Use 'Vector image' consistently everywhere, instead of 'Svg Image' in some places, and 'Vector Image' in others. Lowercase 'image' for consistency with multi-word field name strings in core.
• Add an appropriate field type description.
  

  • For uploading scalable vector graphics (SVG) images.
  • Can be configured with display options such as inline rendering, SVG sanitization, apply dimensions, and more.

Remaining tasks

User interface changes

API changes

Data model changes