feat(lexical): add alt text on link node

[mihajlovco]

This PR allow users to specify "alt text" to link. Technically in HTML, we add alt attribute to a link <a href="https://link.com" alt="link with alt text">

Changes

• Logically split the views, edit and review have new components: LinkEditForm and LinkReviewForm

Custom command and plugin for the link.

The default implementation of the Link payload doesn't support the alt attribute.

• Created new LinkNodeAttributesPayload payload
• New command TOGGLE_LINK_NODE_COMMAND to toggle the link creating
• Create a custom LinkPlugin that can listen to the new command and toggle the link creation

New alt field for the LinkNode class

• Support alt field by extending the original JSON object and LinkNodeAttributes in the constructor.

Improved UI

• Confirm/Cancel buttons on the edit form.
• When the user clicks on the Cancel button, the user will not see the unsaved changes in the preview page.
• On inputs with labels URL and Alt text, the user can save the form on the enter key.
• On the preview view user can see all link options in a bullet list.

How Has This Been Tested?

Manually

Test

Use case 1:

link-with-alt-text.mov

Use case 2:

working-with-ui.mov

Use case 3:
Convert the legacy link node to our custom link node that supports the rel attribute.
Legacy link data:

Convert the link:

link-implementaion_legacy-link-single-word.mov

Converted legacy link data with test alt text 'a':