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

[mofojed]

• 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 52.38095% with 10 lines in your changes missing coverage. Please review.

Project coverage is 46.71%. Comparing base (9d6719a) to head (a67797b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/console/src/Console.tsx	47.36%	10 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2324   +/-   ##
=======================================
  Coverage   46.71%   46.71%           
=======================================
  Files         704      704           
  Lines       39013    39031   +18     
  Branches     9932     9937    +5     
=======================================
+ Hits        18224    18234   +10     
+ Misses      20778    20743   -35     
- Partials       11       54   +43     

Flag	Coverage Δ
unit	46.71% <52.38%> (+<0.01%)	⬆️

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