Support printing via the browser from sdk

#### Is your feature request related to a problem? Please describe

H2O Wave is a great tool for building beautiful, browser-based applications and dashboards. It would be very useful to have an option to generate a PDF version of any of the wave app screens. Providing support for printing via the browser by capturing the wave components is a good option. Currently, print capture only the visible part of the page. With this users can capture the client-side state changes without a hassle. (ex: changes made to the interactive plots on the client-side)

#### Describe the solution you'd like

Support printing via the browser. This can be achieved by introducing appropriate CSS rules to @media print section.

#### Describe alternatives you've considered

(A clear and concise description of any alternative solutions or features you've considered.)

#### Additional context

Captures only the visible part of the screen.