pw_log_tokenized: Log metadata updates

- Add an optional line number to the 32-bit log tokenized payload.
- Update default payload field widths.
       Log level:  3 bits
     Line number: 11 bits (up to 2047, 0 if larger)
           Flags:  2 bits (implementation defined)
    Module token: 16 bits
- Use the maximum log level to indicate that a log is an assert. This
  preserves an additional bit which can be used for the flags or line
  number.
- Store data as key-value pairs in the format string.
- Reorganize pw_log_tokenized tests and add C tests.

Change-Id: I1daa2e6ce40038f96857caeb38976cf48f620dc3
Requires: pigweed-internal:12920
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/47861
Reviewed-by: Keir Mierle <keir@google.com>
Commit-Queue: Wyatt Hepler <hepler@google.com>
diff --git a/pw_assert_log/assert_log.cc b/pw_assert_log/assert_log.cc
index 9d8b9ba..278fa49 100644
--- a/pw_assert_log/assert_log.cc
+++ b/pw_assert_log/assert_log.cc
@@ -19,11 +19,11 @@
 extern "C" void pw_assert_HandleFailure(void) {
 #if PW_ASSERT_ENABLE_DEBUG
   PW_LOG(PW_LOG_LEVEL_CRITICAL,
-         PW_LOG_ASSERT_FAILED_FLAG,
+         PW_LOG_DEFAULT_FLAGS,
          "Crash: PW_ASSERT() or PW_DASSERT() failure");
 #else
   PW_LOG(PW_LOG_LEVEL_CRITICAL,
-         PW_LOG_ASSERT_FAILED_FLAG,
+         PW_LOG_DEFAULT_FLAGS,
          "Crash: PW_ASSERT() failure. Note: PW_DASSERT disabled");
 #endif  // PW_ASSERT_ENABLE_DEBUG
   PW_UNREACHABLE;