Write SequenceNumber in jboss-logmanager-ecs-formatter

Hi,

because the "@timestamp" fields in ECS logging only support millisecond-precision, a sequence number is needed to keep the order of events. Adding this sequence number in FileBeat does not seem possible - only workarounds exist which include disabling multithreading (see https://discuss.elastic.co/t/sequence-number-for-ecs-events-received-by-tcp/291348 ).

Thus, the ECS formatter should add the sequence number ( https://www.elastic.co/guide/en/ecs/current/ecs-event.html#field-event-sequence ).

In case of the `co.elastic.logging.jboss.logmanager.EcsFormatter` this should be trivial as the `ExtLogRecord` from which the JSON is built already includes a method `getSequenceNumber`.

Adding the sequence number would solve a range of other issues regarding to log event order.

co.elastic.logging.jboss.logmanager.EcsFormatter から始めて、ExtLogRecord がどのように JSON に変換されるかを追跡します。ECS の event.sequence フィールドの定義と、issue では名前が挙げられていない既存の formatter のテストカバレッジを確認します。formatter の出力に record のシーケンス番号が ECS イベント構造に含まれれば完了です。

索引モデルが issue の本文から書いたものです。