Add support for package executors and support for PTY handling (#100)

* define contract for package executors

* introduce npx executor

* add npx and pnpx cmd support

* fix typo

* rm PackageExecutor and depend on PackageManager interface

* add support for PTY to handle parent-child process interaction

* refactor PTY handling in proxy flow

* enforce interactiveSession interface check

* close reader explicitly and clean npm version for pkg executors

* rm interaction from interceptors

* add docs and wait for outputRouter before exit

* add support for non interactive TTY for proxy mode

* add support for CI env var check for non interactive tty proxy mode

* update readme to include npx, pnpx support

* Update internal/flows/proxy_flow.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Sahil Bansal <bansalsahil315@gmail.com>

* update ptyx lib

* fix docs typo

---------

Signed-off-by: Sahil Bansal <bansalsahil315@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

proxy/interceptors/npm_registry.go

@@ -6,7 +6,6 @@ import (
 	packagev1 "buf.build/gen/go/safedep/api/protocolbuffers/go/safedep/messages/package/v1"
 	"github.com/safedep/dry/log"
 	"github.com/safedep/pmg/analyzer"
-	"github.com/safedep/pmg/guard"
 	"github.com/safedep/pmg/proxy"
 )
 
@@ -30,14 +29,12 @@ func NewNpmRegistryInterceptor(
 	analyzer analyzer.PackageVersionAnalyzer,
 	cache AnalysisCache,
 	confirmationChan chan *ConfirmationRequest,
-	interaction guard.PackageManagerGuardInteraction,
 ) *NpmRegistryInterceptor {
 	return &NpmRegistryInterceptor{
 		baseRegistryInterceptor: baseRegistryInterceptor{
 			analyzer:         analyzer,
 			cache:            cache,
 			confirmationChan: confirmationChan,
-			interaction:      interaction,
 		},
 	}
 }