Backend Plugins: (breaking change) Add PluginContext (#23788)

* breaking change for newer backend plugins
* use exported protobuf converters and sdk types to reduce duplicate code
* uses grafana-plugin-sdk-go@v0.54.0

pkg/plugins/backendplugin/contracts.go

@@ -2,10 +2,6 @@ package backendplugin
 
 import (
 	"strconv"
-	"time"
-
-	"github.com/grafana/grafana/pkg/components/simplejson"
-	"github.com/grafana/grafana/pkg/models"
 
 	"github.com/grafana/grafana-plugin-sdk-go/genproto/pluginv2"
 )
@@ -76,38 +72,6 @@ type CollectMetricsResult struct {
 	PrometheusMetrics []byte
 }
 
-type DataSourceConfig struct {
-	ID                      int64
-	Name                    string
-	URL                     string
-	User                    string
-	Database                string
-	BasicAuthEnabled        bool
-	BasicAuthUser           string
-	JSONData                *simplejson.Json
-	DecryptedSecureJSONData map[string]string
-	Updated                 time.Time
-}
-
-type PluginConfig struct {
-	OrgID                   int64
-	PluginID                string
-	JSONData                *simplejson.Json
-	DecryptedSecureJSONData map[string]string
-	Updated                 time.Time
-	DataSourceConfig        *DataSourceConfig
-}
-
-type CallResourceRequest struct {
-	Config  PluginConfig
-	Path    string
-	Method  string
-	URL     string
-	Headers map[string][]string
-	Body    []byte
-	User    *models.SignedInUser
-}
-
 // CallResourceResult call resource result.
 type CallResourceResult struct {
 	Status  int