[B-42948][TK-75485] add metrics to JdbcFeedSource/Publisher 

Add metrics to JdbcFeedSource and JdbcFeedPublisher. For methods that involve pageSize, we bucketize the metrics to the following based on the value of the pageSize:

1 - 249 ==> tiny
250 - 499 => small
500 - 749 => medium
750 - 1000 => large