improve build times by extracting asset opt into its own crate (#3273)

* improve build types by extracing asset opt as a dylib
* dont use dylib, but let regular workspace caching do the heavy lifting
* add prebuild to cli for better lock contention
* hoist deps
* disable slow tests
* re-enable sequential, debug=0 for dev
* use vfs for windows
* dont cache on failure, fix windows vfs caceh
* free disk space re-order
* add clippy + fmt to windows channel
* yoink makefile
* proper rustfmt/clippy on toolchain
* set incremental to zero since cargo-cache disables it

.github/workflows/setup-dev-drive.ps1

@@ -0,0 +1,25 @@
+# This creates a 20GB dev drive, and exports all required environment
+# variables so that rustup, uv and others all use the dev drive as much
+# as possible.
+$Volume = New-VHD -Path C:/uv_dev_drive.vhdx -SizeBytes 20GB |
+					Mount-VHD -Passthru |
+					Initialize-Disk -Passthru |
+					New-Partition -AssignDriveLetter -UseMaximumSize |
+					Format-Volume -FileSystem ReFS -Confirm:$false -Force
+
+Write-Output $Volume
+
+$Drive = "$($Volume.DriveLetter):"
+$Tmp = "$($Drive)/uv-tmp"
+
+# Create the directory ahead of time in an attempt to avoid race-conditions
+New-Item $Tmp -ItemType Directory
+
+Write-Output `
+	"DEV_DRIVE=$($Drive)" `
+	"TMP=$($Tmp)" `
+	"TEMP=$($Tmp)" `
+	"RUSTUP_HOME=$($Drive)/.rustup" `
+	"CARGO_HOME=$($Drive)/.cargo" `
+	"UV_WORKSPACE=$($Drive)/uv" `
+	>> $env:GITHUB_ENV