Add search pagination + other fixes

[rbennettcw]

Link to Issue

Closes: #3449
Closes: #3404
Closes: #3406

Description of Changes

• Adds pagination for search pages (threads, replies)
• Fixed malformed URI sort bug
• Fixes issue with comment search results not showing full search text

Test Plan

• From the home page (unscoped), search for a popular term and submit to see the search results page
• Scroll to the bottom and confirm that new results are loaded when bottom is reached (infinite scroll)
• Switch tabs, confirm that tab is updated and URL is updated with tab name
• Navigate to a tabbed URL (http://localhost:8080/search?q=amazing&chainScope=all_chains&sort=Best&tab=Replies) – confirm that the page initializes on the Replies tab
• Repeat steps from beginning, for a specific scope (e.g. dydx, Ethereum)

Deployment Plan

N/A

Other Considerations

N/A

[jnaviask]

Getting an error when I click from the "threads" to the "replies" tab:

GET /api/searchDiscussions?chain=dydx&search=great&page_size=6&sort=Best 200 34.894 ms - -
Error: Named bind parameter "$chains" has no value in the given object.

[rbennettcw]

@jnaviask Fixed chain bug.

[jnaviask]

Excellent work.