Merge bitcoin/bitcoin#29419: log: deduplicate category names and improve logging.cpp

b0344c219a logging: remove unused BCLog::UTIL (Vasil Dimov)
d3b3af9034 log: deduplicate category names and improve logging.cpp (Vasil Dimov)

Pull request description:

  The code in `logging.cpp` needs to:
  * Get the category name given the flag (e.g. `BCLog::PRUNE` -> `"prune"`)
  * Get the flag given the category name (e.g. `"prune"` -> `BCLog::PRUNE`)
  * Get the list of category names sorted in alphabetical order

  Achieve this by using the proper std containers. The result is
  * less code (the diff of the first commit is +62 / -129)
  * faster code (to linear search and no copy+sort)
  * more maintainable code (the categories are no longer duplicated in `LogCategories[]` and `LogCategoryToStr()`)

  This behavior is preserved:
  `BCLog::NONE` -> `""` (lookup by `LogCategoryToStr()`)
  `""` -> `BCLog::ALL` (lookup by `GetLogCategory("")`)

  ---

  Also remove unused `BCLog::UTIL`.

  ---

  These changes (modulo the `BCLog::UTIL` removal) are part of https://github.com/bitcoin/bitcoin/pull/29415 but they make sense on their own and would be good to have them, regardless of the fate of https://github.com/bitcoin/bitcoin/pull/29415. Also, if this is merged, that would reduce the size of https://github.com/bitcoin/bitcoin/pull/29415, thus the current standalone PR.

ACKs for top commit:
  davidgumberg:
    crACK b0344c219a
  pinheadmz:
    ACK b0344c219a
  ryanofsky:
    Code review ACK b0344c219a. Nice cleanup! Having to maintain multiple copies of the same mapping seemed messy and a like a possible footgun. I checked old and new mappings in both directions and confirmed no behavior should be changing.

Tree-SHA512: 57f87a090932f9b33dc8e075d1855dba9b71a3243a0758511745483dec2d9c46d3b532eadab297e78164c9b7caba370986ee380696a45f0778a841082f8e21a7

src/logging.h

@@ -65,11 +65,10 @@ namespace BCLog {
 #ifdef DEBUG_LOCKCONTENTION
         LOCK        = (1 << 24),
 #endif
-        UTIL        = (1 << 25),
-        BLOCKSTORAGE = (1 << 26),
-        TXRECONCILIATION = (1 << 27),
-        SCAN        = (1 << 28),
-        TXPACKAGES  = (1 << 29),
+        BLOCKSTORAGE = (1 << 25),
+        TXRECONCILIATION = (1 << 26),
+        SCAN        = (1 << 27),
+        TXPACKAGES  = (1 << 28),
         ALL         = ~(uint32_t)0,
     };
     enum class Level {