ESQL: Per shard metrics for the `LuceneOperator`s and `ValuesSourceReaderOperator`

[nik9000]

Description

Right now the LuceneSourceOperator's profile contains:

              "processed_shards" : [
                "test2:0",
                "test:0"
              ],
              "process_nanos" : 40776172,
              "pages_emitted" : 414,
              "rows_emitted" : 2000000,

It'd be pretty useful to change processed_shards into:

              "processed_shards" : {
                "test2:0": { "process_nanos": 20776172, "pages_emitted": 200, "rows_emitted": 1000000},
                "test:0": { "process_nanos": 20776172, "pages_emitted": 200, "rows_emitted": 1000000},
              },

We should keep the overall process_nanos in the output - but it'd be super nice to break this down per shard.

It'd be lovely to do this to all subclasses of LuceneOperator and the ValuesSourceReaderOperator.

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)