Restore DocumentUtil.toMap(ODocument, boolean) to fix the master build

[vharseko]

Problem

master does not compile since #245 was merged:

openidm-repo-orientdb/.../DocumentUtil.java:[106,33] error: cannot find symbol
  symbol:   variable topLevel
openidm-repo-orientdb/.../DocumentUtil.java:[111,20] error: cannot find symbol
  symbol:   variable topLevel

Two merged PRs collided without a textual conflict:

• [#236] Remove five unused private-method parameters #239 (Remove six genuinely unused private-method parameters hidden by the java/unused-parameter exclusion #236) removed the topLevel parameter of the private DocumentUtil.toMap(ODocument, boolean) overload as unused and folded it into the public toMap(ODocument).
• [#242] Map version and _openidm_id to metadata only where OrientDB means them #245 (OrientDB repo: properties named version / _openidm_id are rewritten into _rev / _id on read #242) was branched before [#236] Remove five unused private-method parameters #239 landed and made toMap read topLevel: only a top level document maps @rid to _id/_rev and a projected @version to _rev; embedded documents are converted as they are. Its CI passed on the older base, and the squash merge applied cleanly on top of [#236] Remove five unused private-method parameters #239.

As a result every open PR fails build-maven / build-docker, because CI builds the merge with the broken master.

Fix

Restore the private toMap(ODocument doc, boolean topLevel) overload:

• the public toMap(ODocument) delegates to it with true;
• asSimpleBinding passes false for embedded documents.

DocumentUtil.java is now byte-for-byte identical to the version from the #245 head (831df0fc0), which was reviewed and tested.

Testing

mvn -pl openidm-repo-orientdb verify: BUILD SUCCESS, 38 tests, 0 failures, 0 errors.

After this is merged, CI of the open PRs (#226, #227, #238, #244, #247, #248) needs a re-run.