Minor JavaDoc improvements
Add code comment around batch grid dialect use of ThreadLocal
OGM-578 Avoid unnecessary object creations in log.trace/debug/info calls
OGM-541 Making NativeNoSqlQuerySpecification immutable
OGM-541 Passing SessionFactory instead of Session as parameter in query parsers
OGM-541 Providing base implementation of DatastoreProvider SPI
OGM-541 Providing base implementation of GridDialect SPI
OGM-541 Using existing infrastructure around HQLQueryPlan to cache translated queries

* Implementing query translator for creating native backend queries via QueryParserService
* Implementing query translator for creating HSearch-based queries
* Implementing OgmQueryLoader based on QueryLoader to load results of JP-QL queries
OGM-541 Moving QueryParserService to SPI package; Adding documentation for it
OGM-541 Translating JP-QL parameters to actual Cypher query parameters
OGM-541 Re-using HQLQueryPlan gives support for polymorphic queries also with JP-QL queries translated to native queries
WIP Temporarily duplicating tests
OGM-541 Incorporating review remarks