Add (obj|tidy)-*_os, and (obj|tidy)-*_subset targets

* The obj-* targets only call clang or clang++ to compile
  C/C++ files, like the tidy-* targets only call clang-tidy.
* Add (obj|tidy)-dir_os and module_os-(obj|tidy) phony targets
  to include only targets of the specified OS.
* Add (obj|tidy)-dir_os_subset and module_os_subset-(obj|tidy) phony targets
  to include only a subset of that OS target group.
  * Most clang-tidy runs produce the same warnings for all variants
    of an OS. The *_subset targets reduce runs over multiple variants.
  * The obj-*subset targets are useful for a quick test to compile
    at least one variant of every C/C++ file for each OS.
* The (obj|tidy)-soong phony target is changed to include only
  (obj|tidy)-top_level_directory targets instead of ALL
  module-(obj|tidy) targets in all subdirectories.
* For aosp_arm64-eng make tidy-* targets; count NINJA commands:
    tidy-soong                     381K
    tidy-soong_subset              106K
    tidy-soong_android             294K
    tidy-soong_android_subset       73K
    tidy-soong_linux_glibc          84K
    tidy-soong_windows              12K
    tidy-bionic                     12K
    tidy-bionic_subset               2.4K
    tidy-bionic_android             11.5K
    tidy-bionic_android_subset       2.1K
    tidy-bionic_linux_glibc          1K
    tidy-device_android              7K
    tidy-device_android_subset       5K
    tidy-hardware_android            3K
    tidy-hardware_android_subset     9K
    libfec_rs-tidy                   33
    libfec_rs_subset-tidy             9
    libfec_rs_android-tidy           18
    libfec_rs_android_subset-tidy     3
* For aosp_arm64-eng make obj-* targets; count NINJA commands:
    obj-soong                      399K
    obj-soong_subset               112K
    obj-soong_android              305K
    obj-soong_android_subset        75K
    obj-soong_linux_glibc           90K
    obj-soong_linux_glibc_subset    38K
    obj-soong_windows               12K
    obj-bionic                      15K
    obj-bionic_subset                3K
    obj-bionic_android              14K
    obj-bionic_android_subset        2.3K
    obj-bionic_linux_glibc           1.3K
    obj-system-core                  6K
    obj-system-core_subset           3K
    obj-frameworks-base             16K
    obj-frameworks-base_subset       6K
    libfec_rs-obj                    33
    libfec_rs_subset-obj              9
    libfec_rs_android-obj            18
    libfec_rs_android_subset-obj      3

Test: NINJA_ARGS="-n" WITH_TIDY=1 make some_obj_tidy_target;
      compare output commands from various phony targets
Bug: 199169329
Bug: 202769240
Change-Id: I186c45dc07c5884888c1063dfc09cf212ffb0ebf