Added bevy_spatial for boid interactions

I'm finally starting on the actual Boids flocking algorithm parts.
I don't want to iterate over all the things, and Bevy doesn't seem to
have fast collision testing yet, so I've reached for bevy_spatial to
track my Boids.

Cargo.lock

@@ -308,6 +308,7 @@ name = "bevy-testing"
 version = "0.1.0"
 dependencies = [
  "bevy",
+ "bevy_spatial",
 ]
 
 [[package]]
@@ -903,6 +904,18 @@ dependencies = [
  "uuid",
 ]
 
+[[package]]
+name = "bevy_spatial"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f0857f70fec5515c9ec93d23f5d4bf9fd9d9863198ce64c5878de5fab1a852d"
+dependencies = [
+ "bevy",
+ "kd-tree",
+ "num-traits",
+ "typenum",
+]
+
 [[package]]
 name = "bevy_sprite"
 version = "0.14.0"
@@ -1521,6 +1534,25 @@ dependencies = [
  "crossbeam-utils",
 ]
 
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "613f8cc01fe9cf1a3eb3d7f488fd2fa8388403e97039e2f73692932e291a770d"
+dependencies = [
+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
+dependencies = [
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "crossbeam-utils"
 version = "0.8.20"
@@ -2178,6 +2210,19 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "kd-tree"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f89ee4e60e82cf7024e5e94618c646fbf61ce7501dc5898b3d12786442d3682"
+dependencies = [
+ "num-traits",
+ "ordered-float",
+ "paste",
+ "rayon",
+ "typenum",
+]
+
 [[package]]
 name = "khronos-egl"
 version = "6.0.0"
@@ -2808,6 +2853,15 @@ dependencies = [
  "libredox",
 ]
 
+[[package]]
+name = "ordered-float"
+version = "4.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19ff2cf528c6c03d9ed653d6c4ce1dc0582dc4af309790ad92f07c1cd551b0be"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "overload"
 version = "0.1.1"
@@ -3028,6 +3082,26 @@ version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "20675572f6f24e9e76ef639bc5552774ed45f1c30e2951e1e99c59888861c539"
 
+[[package]]
+name = "rayon"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b418a60154510ca1a002a752ca9714984e21e4241e804d32555251faf8b78ffa"
+dependencies = [
+ "either",
+ "rayon-core",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1465873a3dfdaa8ae7cb14b4383657caab0b3e8a0aa9ae8e04b044854c8dfce2"
+dependencies = [
+ "crossbeam-deque",
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "rectangle-pack"
 version = "0.4.2"
@@ -3512,6 +3586,12 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "059d83cc991e7a42fc37bd50941885db0888e34209f8cfd9aab07ddec03bc9cf"
 
+[[package]]
+name = "typenum"
+version = "1.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"