Encode url search parameter when performing query

[maeb]

Description

Searching for URL's with semicolons fails because the url search paramater is not encoded in the request from the frontend to the backend. The backend receives the full URL but in the request to the CDXJ server the request is cutoff at (and including) the first semicolon.

Motivation and Context

#656

Types of changes

• [ X] Bug fix (non-breaking change which fixes an issue)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added or updated tests to cover my changes.
• All new and existing tests passed.

[ikreymer]

Thanks!