feat: multiple search indexes (#2514)

* refactor: abstract search interface

* wip: ~

* fix cycle import

* objs update hook

* wip: ~

* Delete search/none

* auto update index while cache changed

* db searcher

TODO: bleve init issue

cannot open index, metadata missing

* fix size type

why float64??

* fix typo

* fix nil pointer using

* api adapt ui

* bleve: fix clear & change struct

internal/search/searcher/manage.go

@@ -0,0 +1,9 @@
+package searcher
+
+type New func() (Searcher, error)
+
+var NewMap = map[string]New{}
+
+func RegisterSearcher(config Config, searcher New) {
+	NewMap[config.Name] = searcher
+}