[commands] Rename Java factory wait() to waitSeconds() (#4684)

This is needed to avoid a conflict with Object.wait() when using static imports.
C++ doesn't have this issue, and has units, so Wait() still makes sense there.

wpilibNewCommands/src/main/java/edu/wpi/first/wpilibj2/command/Commands.java

@@ -100,7 +100,7 @@ public final class Commands {
    * @return the command
    * @see WaitCommand
    */
-  public static CommandBase wait(double seconds) {
+  public static CommandBase waitSeconds(double seconds) {
     return new WaitCommand(seconds);
   }