Implement search functionality for the content bank

Requirements Test with all supported browsers. Test with boost and classic. Setup Create a course  (C1) and enrol a teacher. Log in as a teacher. Go to the course C1. Access to the "Content bank". Click on the Upload button. Upload "chart.h5p" file and 'Save changes'. Click on the Upload button. Upload "chart.h5p" file, save it as "NewChart.h5p"  and 'Save changes'. Upload "chart.h5p" file, save it as "file.h5p"  and 'Save changes'. Testing scenario: Search Log in as a teacher. Go to the course C1 and access to the "Content bank". Check 3 contents are displayed alphabetically (chart.h5p, file.h5p and NewChart.h5p). Check the search box is displayed. Write "chart" into the search box. Check the search icon has been replaced by a cancel icon. Check the text "2 items found" is displayed. Check the file.h5p file is not displayed. Check the text "chart" is highlighted, respecting upper/lower case. Click the clear button. Check the "x items found" text is replaced again by the folder icon. Check all the contents are displayed again.