Perform NullAway build-time checks in more modules

This commit enables null-safety build-time checks in:
 - spring-jdbc
 - spring-r2dbc
 - spring-orm
 - spring-beans
 - spring-aop

See gh-32475

spring-r2dbc/src/main/java/org/springframework/r2dbc/connection/lookup/AbstractRoutingConnectionFactory.java

@@ -142,6 +142,7 @@ public abstract class AbstractRoutingConnectionFactory implements ConnectionFact
 	 * @see #setTargetConnectionFactories(Map)
 	 * @see #setDefaultTargetConnectionFactory(Object)
 	 */
+	@SuppressWarnings("NullAway")
 	public void initialize() {
 		Assert.notNull(this.targetConnectionFactories, "Property 'targetConnectionFactories' must not be null");
 
@@ -220,6 +221,7 @@ public abstract class AbstractRoutingConnectionFactory implements ConnectionFact
 	 * per {@link #determineCurrentLookupKey()}
 	 * @see #determineCurrentLookupKey()
 	 */
+	@SuppressWarnings("NullAway")
 	protected Mono<ConnectionFactory> determineTargetConnectionFactory() {
 		Assert.state(this.resolvedConnectionFactories != null, "ConnectionFactory router not initialized");
 

spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DefaultDatabaseClient.java

@@ -383,6 +383,7 @@ final class DefaultDatabaseClient implements DatabaseClient {
 			return fetch().rowsUpdated().then();
 		}
 
+		@SuppressWarnings("NullAway")
 		private ResultFunction getResultFunction(Supplier<String> sqlSupplier) {
 			BiFunction<Connection, String, Statement> statementFunction = (connection, sql) -> {
 				if (logger.isDebugEnabled()) {

spring-r2dbc/src/main/java/org/springframework/r2dbc/core/MapBindParameterSource.java

@@ -75,6 +75,7 @@ class MapBindParameterSource implements BindParameterSource {
 	}
 
 	@Override
+	@SuppressWarnings("NullAway")
 	public Parameter getValue(String paramName) throws IllegalArgumentException {
 		if (!hasValue(paramName)) {
 			throw new IllegalArgumentException("No value registered for key '" + paramName + "'");