Add lazy-loading DataTypeTree implementation

[kevinherron]

Summary

• Add LazyClientDataTypeTree that resolves types on demand by browsing inverse HasSubtype references, avoiding eager enumeration of the entire type hierarchy
• Add DataTypeTreeFactory interface with eager() and lazy() factory methods for configuring how the DataTypeTree is created
• Add setDataTypeTreeFactory() method to OpcUaClient to allow switching between eager and lazy tree implementations
• Extract shared browse/read utilities into ClientBrowseUtils class with operation limit handling
• Refactor DataTypeTreeBuilder, ObjectTypeTreeBuilder, and VariableTypeTreeBuilder to use shared utilities
• Add LazyClientDataTypeManager that resolves codecs on demand when types are requested
• Add DataTypeManagerFactory interface with eager() and lazy() factory methods for configuring how the DataTypeManager is created
• Replace setDataTypeManagerInitializer() with setDynamicDataTypeManagerFactory() for greater flexibility

Breaking Changes

The OpcUaClient.setDataTypeManagerInitializer() method has been replaced with setDynamicDataTypeManagerFactory() to support both eager and lazy codec resolution strategies.

Before	After
OpcUaClient.DataTypeManagerInitializer	DataTypeManagerFactory.Initializer
OpcUaClient.DefaultDataTypeManagerInitializer	DataTypeManagerFactory.DefaultInitializer
setDataTypeManagerInitializer(initializer)	setDynamicDataTypeManagerFactory(DataTypeManagerFactory.eager(initializer))

Migration Examples

Custom initializer (e.g., legacy DTD support):

// Before
client.setDataTypeManagerInitializer(new LegacyDataTypeManagerInitializer(client));

// After
client.setDynamicDataTypeManagerFactory(
    DataTypeManagerFactory.eager(new LegacyDataTypeManagerInitializer(client))
);

Custom codec factory:

// Before
client.setDataTypeManagerInitializer(
    new OpcUaClient.DefaultDataTypeManagerInitializer(MyCodecFactory::create)
);

// After
client.setDynamicDataTypeManagerFactory(
    DataTypeManagerFactory.eager(MyCodecFactory::create)
);

Lazy resolution (new feature):

client.setDataTypeTreeFactory(DataTypeTreeFactory.lazy());
client.setDynamicDataTypeManagerFactory(DataTypeManagerFactory.lazy());