fix: Console history did not stick to bottom on visibility changes

[mofojed]

fix: Console history did not stick to bottom on visibility changes

• When debugging, I found that the Code block was rendering while the Console tab was in the background (invisible, size 0) so when it did finally render, there was a lot of content added but it wasn't scrolled. By checking sticky bottom when visibility changes, we handle this situtation where content causes a resize while it is invisible
• Use an IntersectionObserver to detect visibility changes: https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API
• Tested by running the following:

1. Run a code snippet to print a bunch of lines, causing the console history to scroll:

for i in range(0, 200):
    print("i is", i)

2. Run a snippet to create a dashboard, and have a lot of text in the command:

from deephaven import ui

... have lots of blank lines so that it takes up more than a page of scroll space

d = ui.dashboard(ui.panel("Hello"))

3. Go back to the Console tab, see that it is still scroll to the bottom.

[codecov]

Codecov Report

Attention: Patch coverage is 35.71429% with 9 lines in your changes missing coverage. Please review.

Project coverage is 46.70%. Comparing base (57b6e21) to head (e121c90).

Files with missing lines	Patch %	Lines
packages/console/src/Console.tsx	35.71%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2320      +/-   ##
==========================================
- Coverage   46.71%   46.70%   -0.01%     
==========================================
  Files         704      704              
  Lines       39013    39026      +13     
  Branches     9747     9750       +3     
==========================================
+ Hits        18224    18229       +5     
- Misses      20778    20786       +8     
  Partials       11       11              

Flag	Coverage Δ
unit	46.70% <35.71%> (-0.01%)	⬇️

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