Remove modular requirements from `module-info.java` files as well

[mkoncek]

Consider this file from Guava:

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/** Google Guava */
module com.google.common {
  requires java.logging;
  requires transitive com.google.common.util.concurrent.internal;
  requires static jdk.unsupported;
  requires static com.google.errorprone.annotations;
  requires static com.google.j2objc.annotations;
  requires static org.jspecify;

  exports com.google.common.annotations;
  exports com.google.common.base;
  exports com.google.common.cache;
  exports com.google.common.collect;
  exports com.google.common.escape;
  exports com.google.common.eventbus;
  exports com.google.common.graph;
  exports com.google.common.hash;
  exports com.google.common.html;
  exports com.google.common.io;
  exports com.google.common.math;
  exports com.google.common.net;
  exports com.google.common.primitives;
  exports com.google.common.reflect;
  exports com.google.common.util.concurrent;
  exports com.google.common.xml;
}

Currently this macro is used to remove annotations from the Java sources:

%java_remove_annotations guava guava-testlib -s \
  -p org[.]jspecify[.]annotations[.] \
  -p com[.]google[.]common[.]annotations[.] \
  -p com[.]google[.]errorprone[.]annotations[.] \
  -p com[.]google[.]j2objc[.]annotations[.] \

But it ignores the requirements listed in module-info.java file.
It would be nice if the tool could do that as well.
Issues to fix first:

• New CLI option, ideally to be used concurrently with annotation / import removal.
• Module names can be different from package names, but can also be the same and it would be convenient not have to specify them twice.
• Consider which keywords to search for. Most often it will be requires but what about exports, uses, opens, provides?