Add query param to timeline view for deep linking

[everett980]

Requirement - what kind of business use case are you trying to solve?

Ability to link to a trace with a specified spanId selected and scrolled into view.

Problem - what in Jaeger blocks you from solving the requirement?

Currently there is no ability to link to a specific span.

Proposal - what do you suggest to solve the problem or improve the existing situation?

Add an optional query param for spanId to specify which span should be selected and in view.

Any open questions to address

What to do if spanId is absent?
a) Ignore query param and behave as though not present.
b) (a) + small indicator that span id was not found

[yurishkuro]

I would add a dismissible warning banner at the top indicating that span id is not found in the trace