qemu: Completely rewrite QMP client from scratch

It sucked. The new one is using Sans I/O principles, so it does not
directly do I/O or talk to a net.Socket directly (instead, QemuVM implements
the layer to do I/O). This means in the future this library could actually
be tested, but for now, I'm not bothering with that.

There's also some other cleanups that were bothering me.

yarn.lock

@@ -92,10 +92,8 @@ __metadata:
   dependencies:
     "@computernewb/nodejs-rfb": "npm:*"
     "@cvmts/shared": "npm:*"
-    "@types/split": "npm:^1.0.5"
     execa: "npm:^8.0.1"
     parcel: "npm:^2.12.0"
-    split: "npm:^1.0.1"
   languageName: unknown
   linkType: soft
 
@@ -1545,22 +1543,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/split@npm:^1.0.5":
-  version: 1.0.5
-  resolution: "@types/split@npm:1.0.5"
+"@types/node@npm:^20.14.10":
+  version: 20.14.10
+  resolution: "@types/node@npm:20.14.10"
   dependencies:
-    "@types/node": "npm:*"
-    "@types/through": "npm:*"
-  checksum: 10c0/eb187a3b07e5064928e49bffd5c45ad1f1109135fee52344bb7623cdb55e2ebb16bd6ca009a30a0a6e2b262f7ebb7bf18030ff873819e80fafd4cbb51dba1a74
-  languageName: node
-  linkType: hard
-
-"@types/through@npm:*":
-  version: 0.0.33
-  resolution: "@types/through@npm:0.0.33"
-  dependencies:
-    "@types/node": "npm:*"
-  checksum: 10c0/6a8edd7f40cd7e197318e86310a40e568cddd380609dde59b30d5cc6c5f8276ddc698905eac4b3b429eb39f2e8ee326bc20dc6e95a2cdc41c4d3fc9a1ebd4929
+    undici-types: "npm:~5.26.4"
+  checksum: 10c0/0b06cff14365c2d0085dc16cc8cbea5c40ec09cfc1fea966be9eeecf35562760bfde8f88e86de6edfaf394501236e229d9c1084fad04fb4dec472ae245d8ae69
   languageName: node
   linkType: hard
 
@@ -1998,7 +1986,7 @@ __metadata:
     "@parcel/packager-ts": "npm:2.12.0"
     "@parcel/transformer-sass": "npm:2.12.0"
     "@parcel/transformer-typescript-types": "npm:2.12.0"
-    "@types/node": "npm:^20.12.5"
+    "@types/node": "npm:^20.14.10"
     just-install: "npm:^2.0.1"
     parcel: "npm:^2.12.0"
     prettier: "npm:^3.2.5"
@@ -3713,15 +3701,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"split@npm:^1.0.1":
-  version: 1.0.1
-  resolution: "split@npm:1.0.1"
-  dependencies:
-    through: "npm:2"
-  checksum: 10c0/7f489e7ed5ff8a2e43295f30a5197ffcb2d6202c9cf99357f9690d645b19c812bccf0be3ff336fea5054cda17ac96b91d67147d95dbfc31fbb5804c61962af85
-  languageName: node
-  linkType: hard
-
 "sprintf-js@npm:^1.1.3":
   version: 1.1.3
   resolution: "sprintf-js@npm:1.1.3"
@@ -3855,13 +3834,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"through@npm:2":
-  version: 2.3.8
-  resolution: "through@npm:2.3.8"
-  checksum: 10c0/4b09f3774099de0d4df26d95c5821a62faee32c7e96fb1f4ebd54a2d7c11c57fe88b0a0d49cf375de5fee5ae6bf4eb56dbbf29d07366864e2ee805349970d3cc
-  languageName: node
-  linkType: hard
-
 "timsort@npm:^0.3.0":
   version: 0.3.0
   resolution: "timsort@npm:0.3.0"