Add functionality to filter flame graphs by search query

[vivster7]

Adds a 🎯 button to the ctrl+f search bar that toggles an 'exact match' filter mode -- it only shows frames that exactly match the search query.

Personal.perf-vertx-stacks-01-collapsed-all.txt.-.speedscope.-.16.March.2025.mp4

This is one possible implementation for #192

The use case I was trying to support: simplify large call graphs into first party code vs specific third party libraries. Seems related to the following issues as well

• FeatureRequest: only "my code" #246
• Allow search by filename #468

Filtering the profile on keystroke feels like a fairly expensive operation, but I wasn't sure how else to implement. My fork solves my use case, but would be nice to upstream this feature if you'd accept this patch or a similar variant.

[jack-mcivor]

@vivster7 does this implement searching by filename #468 ?

I think that for my profile (Python code, generated with Autin) filtering by filename is the only way to achieve a distinction between first party code & specific third party libraries