Remove broken PostgresClient.get(String table, Object entity, ...) methods

The PostgresClient#get(String table, Object entity, ...) methods are broken since RMB v29.0.0 (RMB-497 https://github.com/folio-org/raml-module-builder/commit/51a67d3b81b372096c11ddcc8e7b0af6db48c744 ) because

pojo = pojo2json(entity);
...
"@>'" + pojo + "' 

was removed. The filtering no longer works, the query always returns all records. The unit test doesn't check that the filtering works.

Since the release of RMB v29.0.0 no one has complained about this bug. This shows that these PostgresClient methods are not in use.

PostgresClient methods that take a CQLWrapper or a Criteria filter can be used instead.

Task:

Remove the methods.