Support npipe transport in confignet (#14985)

#### Description

Support using Windows named pipes as a transport in confignet. The
implementation uses https://github.com/microsoft/go-winio/.

#### Link to tracking issue
Fixes
#15085

#### Testing

Added unit tests covering the new transport. There's also a unit test
for validating named path paths.

#### Documentation

Added the new value to the config schema and README.

---------

Co-authored-by: Alex Boten <223565+codeboten@users.noreply.github.com>

Author: swiatekm

.chloggen/confignet-npipe.yaml

@@ -0,0 +1,4 @@
+change_type: enhancement
+component: pkg/config/confignet
+note: Add support for Windows Named Pipe (npipe) transport
+issues: [15085]

.github/workflows/utils/cspell.json

@@ -336,6 +336,7 @@
       "nopreceiver",
       "nosuchprocessor",
       "notls",
+      "npipe",
       "obsreceiver",
       "obsreport",
       "obsreporttest",

cmd/mdatagen/go.mod

@@ -51,6 +51,7 @@ require (
 )
 
 require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect

cmd/mdatagen/go.sum

@@ -34,6 +34,7 @@ require (
 )
 
 require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect

cmd/otelcorecol/go.mod

@@ -30,6 +30,7 @@ require (
 )
 
 require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/foxboron/go-tpm-keyfiles v0.0.0-20251226215517-609e4778396f // indirect

cmd/otelcorecol/go.sum

@@ -33,6 +33,7 @@ require (
 )
 
 require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	go.opentelemetry.io/collector/internal/componentalias v0.150.0 // indirect
 )