Handle page and query url consistently in CatalogSearchView

[robyngit]

To make the new CatalogSearchView behaviour consistent with the old DataCatalogView, it needs to do the following:

• In the following case, the CatalogSearchView should automatically switch back to the last viewed page of the search results: A user performs a search, switches to page n of the results, then clicks to navigate somewhere else in the app (e.g. clicks on a dataset), then clicks the back button. The url will be formatted as {REPO-URL}/data/page/{n}, and thus the search results should return to page n
• When a user is on page n of search results and refreshes the page, the CatalogSearchView should remove the page/{n} part of the URL and return to the first page of the results. This is the current behaviour of the DataCatalogView. Alternatively, we could navigate to page n in that case.
• When a query is appended to the end of the URL (e.g. {REPO-URL}/data/query=test), the catalog should automatically trigger a search for that query.

When fixing this issue, we should ensure that we don't re-introduce the bugs described in #971 and #723.

(Ideally the query would also be added to the URL so that a user could navigate back to the same search results, but this is an enhancement for another issue)

[robyngit]

(Blocks #1520)

[robyngit]

Complete in feature-#1720-cesium-data-catalog branch