experimentation with debugdump

[Vrixyz]

Objective

• I appreciate graphs from bevy_mod_debugdump, this PR merely starts a discussion on adding some "first party" interest to such graphs.
• it can be useful to compare with bevy_rapier: Add example to output a debugdump dimforge/bevy_rapier#576

Solution

• Add an example to generate those

Run with: cargo run --example debugdump_3d > avian.dot && dot -Tsvg avian.dot > avian.svg

Output for 3d

PhysicsSchedule

SubstepSchedule

FixedPostUpdate

Update

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Changelog

• Add an example to generate systems ordering graphs.

[Vrixyz]

As of f161a74 ; Attempting to make a graph for SubstepSchedule results in an error.

• I opened an upstream issue: Missing quotes in a tooltip results in error while creating graph. jakobhellermann/bevy_mod_debugdump#51.

[Jondolf]

Thanks! This is really useful. The SubstepSchedule issue is unfortunate, but not a blocker here imo.