[MWPW-155566] [MEP] Allow relevant actions in MEP to use text and HTML instead of just fragments

[denlight]

• Expanded the functionality of the several actions to allow text or HTML instead of just fragments: (replace, insertbefore, insertafter, prependToSection and appendToSection) It is intended to update innerText of the targeted element.(ex: update a column/row combination text to change the index of a selected tab)
• now that prependToSection and appendToSection can text and HTML, also lifted the restriction they be used on sections and are renamed append and prepend
• Added new "helper" selectors: primary-cta, secondary-cta, action-area with an ability to pair those with the #_href flag to update the href attributes where applicable.
• Added ability to combine simplified and "pseudo"(simplified) selectors.

Resolves:
MWPW-155566

Also resolves:
MWPW-148285 [MILO][MEP] Add simplified selector to select the paragraph around a block's links - one of the best use cases for the update action, so was added to this PR
MWPW-148284 [MILO][MEP] Allow selectors to have a mix of CSS and simplified selectors - update for 148285 also ended up solving this

URL for testing:

• Before: https://main--cc--adobecom.hlx.live/drafts/dfedotov/fragments/test-no-update?martech=off
• After: https://main--cc--adobecom.hlx.live/drafts/dfedotov/fragments/test-no-update?martech=off&milolibs=MWPW-148284

Psi-check: https://mwpw-148284--milo--adobecom.hlx.page/?martech=off

Recent updates to this PR:
updated the getSelectedElement function to have a different approach:

1. no longer adding a new action called update but instead allowing most actions to accept html or text
2. because we allow html and text for most actions, changed appendToSection and prependToSection to just be called append and prepend (retro support for old names)
   3.updated the getSelectedElement function to have a different approach:

• split and join the selector to add spaces around > and , for consistency
• split the selector by whitespace
• loop through each "term" in the selector to figure out if it starts with a simplified selector and/or ends in a child number

benefits to this approach:

1. can recognize consumer blocks
2. can enforce sections are direct children of main but still handle if main is in the selector from manifest
3. can add number when there's a dot. Example .text4

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