In m1, we finished the first "select query statement" feature or "load by primary key", characteristic of simplest where clause (`where _id = ?`). This ticket moves forward by:

• filtering by basic entity's field value comparison (single field)
• filtering by ad-hoc boolean combination (mainly includes "and," "or", "not") of multiple fields

All the comparison operators in https://www.mongodb.com/docs/manual/reference/operator/query/#comparison should be covered, except for `$nin` which has no HQL/Criterion counterpart in Hibernate.

All the logical operators in https://www.mongodb.com/docs/manual/reference/operator/query/#logical should be covered except for `$nor`, which has no HQL/Criterion counterpart in Hibernate

Addressing the source code notes tagged with TODO-HIBERNATE-62 is in scope of this ticket.

This ticket assumes all the comparison is based on existing non-null fields. Field comparison involving null or non-existent field is out of the scope of this ticket.

Sorting and Limit feature ($limit and $skip) are out of scope of this ticket.