Improve parameterization of transaction names

[smeubank]

Environment

How do you use Sentry? Sentry SaaS (sentry.io)

Which SDK and version? sentry-symfony

Steps to Reproduce

similar to https://github.com/getsentry/sentry-laravel/issues/562

Expected Result

Parameterized transactions as often as possible

Actual Result

seems symfony only sends raw URLs for everything

[smeubank]

we should open a convo with Symfony that they add something to help us access their routing properly

[github-actions[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[github-actions[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[cleptric]

So after speaking with various folks during SymfonyCon, we'll likely use the route name as the default source for transaction names. While the _controller property could also be an option, there is the use case of https://symfony.com/doc/4.1/templating/render_without_controller.html which ends up being not very useful.

See #547 for a former discussion