PBJ Compiler fails on comment preceding reserved field or syntax keyword

[jsync-swirlds]

Placing a field comment before a reserved field causes PBJ to fail.

To reproduce:
Add a reserved field with a field comment in any .proto file:

    /**
     * <h2>Removed Field.</h2>
     */
    reserved 8;

The PBJ compiler fails with an error (example from contract_types.proto):

line 142:13 mismatched input '8' expecting {'syntax', 'import', 'weak', 'public', 'package', 'option', 'repeated', 'oneof', 'map', 'int32', 'int64', 'uint32', 'uint64', 'sint32', 'sint64', 'fixed32', 'fixed64', 'sfixed32', 'sfixed64', 'bool', 'string', 'double', 'float', 'bytes', 'reserved', 'to', 'max', 'enum', 'message', 'service', 'rpc', 'stream', 'returns', BOOL_LIT, IDENTIFIER}
line 142:13 mismatched input '8' expecting {'syntax', 'import', 'weak', 'public', 'package', 'option', 'repeated', 'oneof', 'map', 'int32', 'int64', 'uint32', 'uint64', 'sint32', 'sint64', 'fixed32', 'fixed64', 'sfixed32', 'sfixed64', 'bool', 'string', 'double', 'float', 'bytes', 'reserved', 'to', 'max', 'enum', 'message', 'service', 'rpc', 'stream', 'returns', BOOL_LIT, IDENTIFIER}
Exception while processing file: /Users/user/Projects/Hashgraph/Pbj/pbj-integration-tests/build/repos/hapi/services/contract_types.proto
com.hedera.pbj.compiler.impl.PbjCompilerException: Failed to find fully qualified message type for [reserved] in file [/Users/user/Projects/Hashgraph/Pbj/pbj-integration-tests/build/repos/hapi/services/contract_types.proto] imports = [/Users/user/Projects/Hashgraph/Pbj/pbj-integration-tests/build/repos/hapi/services/basic_types.proto]
    com.hedera.pbj.compiler.impl.LookupHelper.getFullyQualifiedProtoName(LookupHelper.java:187)
    com.hedera.pbj.compiler.impl.LookupHelper.isEnum(LookupHelper.java:358)
    com.hedera.pbj.compiler.impl.ContextualLookupHelper.isEnum(ContextualLookupHelper.java:112)
    com.hedera.pbj.compiler.impl.Field$FieldType.of(Field.java:304)
    com.hedera.pbj.compiler.impl.SingleField.<init>(SingleField.java:33)
    com.hedera.pbj.compiler.impl.generators.ModelGenerator.generateCodeForField(ModelGenerator.java:470)
    com.hedera.pbj.compiler.impl.generators.ModelGenerator.generate(ModelGenerator.java:107)
    com.hedera.pbj.compiler.PbjCompilerTask.compileFilesIn(PbjCompilerTask.java:107)

protoc properly ignores the comment, rather than failing to parse the file properly.
The grammar for PBJ appears to be missing a term for the comment preceding the reserved keyword.

[jsync-swirlds]

PBJ also appears to fail if a comment precedes the syntax keyword.
protoc also, appropriately, ignores such comments, and these are needed for automatically generated API documentation.