Limit database connections (#980, #564) (#998)

* Limit database connections (#564)

- Add new options to the config file database:
      max_open_conns: 100
      max_idle_conns: 2
      conn_max_lifetime: -1
- Implement connection parameter setup on the *DB (database/sql) in internal/sqlutil/trace.go:Open()
- Propagate the values in the form of DbProperties interface via all the
  Open() and NewDatabase() functions

Signed-off-by: Tomas Jirka <tomas.jirka@email.cz>

* Fix wasm builds

* Remove file accidentally added from working tree

Co-authored-by: Tomas Jirka <tomas.jirka@email.cz>

mediaapi/storage/storage_wasm.go

@@ -18,11 +18,15 @@ import (
 	"fmt"
 	"net/url"
 
+	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/dendrite/mediaapi/storage/sqlite3"
 )
 
 // Open opens a postgres database.
-func Open(dataSourceName string) (Database, error) {
+func Open(
+	dataSourceName string,
+	dbProperties common.DbProperties, // nolint:unparam
+) (Database, error) {
 	uri, err := url.Parse(dataSourceName)
 	if err != nil {
 		return nil, fmt.Errorf("Cannot use postgres implementation")