all: add read-only option to database (#22407)

* all: add read-only option to database

* all: fixes tests

* cmd/geth: migrate flags

* cmd/geth: fix the compact

* cmd/geth: fix the format

* cmd/geth: fix log

* cmd: add chain-readonly

* core: add readonly notion to freezer

* core/rawdb: add log

* core/rawdb: fix freezer close

* cmd: fix

* cmd, core: construct db

* core: update tests

ethdb/leveldb/leveldb.go

@@ -83,7 +83,7 @@ type Database struct {
 
 // New returns a wrapped LevelDB object. The namespace is the prefix that the
 // metrics reporting should use for surfacing internal stats.
-func New(file string, cache int, handles int, namespace string) (*Database, error) {
+func New(file string, cache int, handles int, namespace string, readonly bool) (*Database, error) {
 	return NewCustom(file, namespace, func(options *opt.Options) {
 		// Ensure we have some minimal caching and file guarantees
 		if cache < minCache {
@@ -96,6 +96,9 @@ func New(file string, cache int, handles int, namespace string) (*Database, erro
 		options.OpenFilesCacheCapacity = handles
 		options.BlockCacheCapacity = cache / 2 * opt.MiB
 		options.WriteBuffer = cache / 4 * opt.MiB // Two of these are used internally
+		if readonly {
+			options.ReadOnly = true
+		}
 	})
 }