Clarify usage of set(Min/Max)(Height/Width) in HasSize

[edler-san]

The above mentioned methods only work on block level elements. Improve the documentation for the respective methods.

PR is here: #5855

[pleku]

As discussed in the PR #5855, we should:

• add a new interface for the set&get-min&max-width&height-methods, with a suitable name
• deprecate the API in HasSize with instructions that it might not work for certain components (inline), and instruct for component developers to use the API in the new interface instead
• update all Vaadin components that actually can support the min&max API to use the new interface instead to make sure the deprecated API is not visible

Anything else ?

[pleku]

It probably would be nice to get this resolved in Flow 2.2 (adding deprecations) so that we could remove the methods in 3.0., related to #6510

[pleku]

For now it would be good to:

• remove the methods in master branch of Flow
• for next 2.x branch deprecate the methods