make DAOs search input execute less often

Currently the DAOs search input executes a DAOs query and re-render of the page on every keypress when the input value is longer than two characters. This is often going to cause a lot of unnecessary queries and renders.

So I would like to propose that change this behavior in either of two ways:

1. execute on enter and blur (loss of focus), or
1. add a search button to the right of the input field, and an 'x' in the input field to clear it. Clicking either one executes.

I think my vote would be 1. This is how I'd like to implement the [new proposal search input](https://github.com/daostack/alchemy/issues/190).

Start at the DAOs search input and review the linked new proposal search input issue (#190); this issue leaves two execution behaviors under consideration. Confirm the chosen interaction with maintainers, then verify that typing no longer triggers a query and page render for every character and that the agreed trigger works.

Written by the indexing model from the issue text.