Update stats periodically after a node is started

[bbondy]

Continuing off of the work in:
brave/brave-core#7948

After a node is started, the stats won't refresh until you reload the page.
If the current page is open and it is active, we should refresh the stats periodically, maybe every 1s.
I think this would be done in componentDidMount with a setInterval and clearInterval when the page is closing.

[stephendonner]

Verified FIXED in 1.22.34 on macOS Big Sure (11.2.1) with

Brave	1.22.34 Chromium: 89.0.4389.48 (Official Build) nightly (x86_64)
Revision	0fe3c4589a6cf5ce719d167834dfa9cd8978937a-refs/branch-heads/4389@{#873}
OS	macOS Version 11.2.1 (Build 20D74)

Steps:

1. open brave://ipfs, click Install and start

2. verified stats about connected peers should be updated in runtime without reloading the page
3. clicked stop button, confirmed stats dropped to zero (as well as Addresses and Node info) and weren't updated until node relaunch, by clicking start
4. clicked restart button, confirmed stats dropped to zero (and Addresses and Node info were nulled out, then re-populated upon node restart