Store active tab state and enable binding tabs to that state

[zgramana]

Use Case

As a user of a specific language, once I select the tab displaying code in my language I want to see all code examples display my language automatically so that I can learn faster, or share a link to a colleague that will open to that tab.

Acceptance Criteria

1. Browsing to /getting-started/hello-world/#csharp should make all tabs active where tab.fct_label equals csharp.
2. Browsing to /getting-started/hello-world/#csharp,docker should make all tabs on that page active where tab.fct_label equals csharp or docker.
3. When two or more tabs in the same tab set satisfy the condition described in (2), use the first match to determine the active tab such that the behavior is functionally equivalent to (1).