Add fit nodes in view func

[ghsteff]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Centering the graph also adjusts the zoom

Issue Number: #130

What is the new behavior?

Centering the graph doesn't change the zoom. There's a new function fitNodesInView that replaces that functionality

Does this PR introduce a breaking change?

[x] Yes - sort of
[ ] No

Other information

This takes the fit/zoom functionality out of the centerGraph function and puts it into a separate fitNodesInView function

This lets users have more control over centering behavior

Screen.Recording.2024-05-23.at.10.18.17.AM.mov

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