New node: Merge by Distance (#2307)

* add `merge_by_distance` node

* remove unneeded features of petgraph

Also re-arrange module slightly since because functions are no longer
async, there was name shadowning with the old arrangement.

* remove region if start or end segment is removed

* remove stuff I ended up not using

* "algos" -> "algorithms"

* Code review pass

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

Cargo.lock

@@ -1751,6 +1751,12 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
+[[package]]
+name = "fixedbitset"
+version = "0.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d674e81391d1e1ab681a28d99df07927c6d4aa5b027d7da16ba32d1d21ecd99"
+
 [[package]]
 name = "flate2"
 version = "1.1.0"
@@ -2482,8 +2488,10 @@ dependencies = [
  "node-macro",
  "num-derive",
  "num-traits",
+ "petgraph 0.7.1",
  "rand 0.9.0",
  "rand_chacha 0.9.0",
+ "rustc-hash 2.1.1",
  "rustybuzz 0.20.1",
  "serde",
  "serde_json",
@@ -3916,7 +3924,7 @@ dependencies = [
  "hexf-parse",
  "indexmap 2.7.1",
  "log",
- "petgraph",
+ "petgraph 0.6.5",
  "rustc-hash 1.1.0",
  "spirv",
  "termcolor",
@@ -4659,7 +4667,17 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4c5cc86750666a3ed20bdaf5ca2a0344f9c67674cae0515bec2da16fbaa47db"
 dependencies = [
- "fixedbitset",
+ "fixedbitset 0.4.2",
+ "indexmap 2.7.1",
+]
+
+[[package]]
+name = "petgraph"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3672b37090dbd86368a4145bc067582552b29c27377cad4e0a306c97f9bd7772"
+dependencies = [
+ "fixedbitset 0.5.7",
  "indexmap 2.7.1",
 ]
 
@@ -7217,7 +7235,7 @@ dependencies = [
  "memchr",
  "nom",
  "once_cell",
- "petgraph",
+ "petgraph 0.6.5",
 ]
 
 [[package]]