feat: implement runtime configuration package with multi-org support (#14624)

runtime configuration package
---------

Signed-off-by: Danny Kopping <danny@coder.com>
Co-authored-by: Danny Kopping <danny@coder.com>

coderd/runtimeconfig/spec.go

@@ -0,0 +1,39 @@
+package runtimeconfig
+
+import (
+	"context"
+
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/v2/coderd/database"
+)
+
+var (
+	// ErrEntryNotFound is returned when a runtime entry is not saved in the
+	// store. It is essentially a 'sql.ErrNoRows'.
+	ErrEntryNotFound = xerrors.New("entry not found")
+	// ErrNameNotSet is returned when a runtime entry is created without a name.
+	// This is more likely to happen on DeploymentEntry that has not called
+	// Initialize().
+	ErrNameNotSet = xerrors.New("name is not set")
+)
+
+type Initializer interface {
+	Initialize(name string)
+}
+
+type Resolver interface {
+	// GetRuntimeConfig gets a runtime setting by name.
+	GetRuntimeConfig(ctx context.Context, name string) (string, error)
+	// UpsertRuntimeConfig upserts a runtime setting by name.
+	UpsertRuntimeConfig(ctx context.Context, name, val string) error
+	// DeleteRuntimeConfig deletes a runtime setting by name.
+	DeleteRuntimeConfig(ctx context.Context, name string) error
+}
+
+// Store is a subset of database.Store
+type Store interface {
+	GetRuntimeConfig(ctx context.Context, key string) (string, error)
+	UpsertRuntimeConfig(ctx context.Context, arg database.UpsertRuntimeConfigParams) error
+	DeleteRuntimeConfig(ctx context.Context, key string) error
+}