Integrate `Queryable` based ESQL builder

[flobernd]

• Fix remaining bugs in https://github.com/elastic/esql-dotnet
• Implement remaining features in https://github.com/elastic/esql-dotnet
• Add Elastic.Clients.Elasticsearch specific EsqlQueryProvider (see https://github.com/elastic/esql-dotnet)
• Add IAsyncEnumerable style EsqlResponseReader