log: Use ConstevalFormatString

This changes all logging (including the wallet logging) to produce a
ConstevalFormatString at compile time, so that the format string can be
validated at compile-time.

Also, while touching the wallet logging, avoid a copy of the template
Params by using const Params&.

test/lint/lint-format-strings.py

@@ -17,15 +17,7 @@ import sys
 
 FUNCTION_NAMES_AND_NUMBER_OF_LEADING_ARGUMENTS = [
     'tfm::format,1',  # Assuming tfm::::format(std::ostream&, ...
-    'LogError,0',
-    'LogWarning,0',
-    'LogInfo,0',
-    'LogDebug,1',
-    'LogTrace,1',
-    'LogPrintf,0',
-    'LogPrintLevel,2',
     'strprintf,0',
-    'WalletLogPrintf,0',
 ]
 RUN_LINT_FILE = 'test/lint/run-lint-format-strings.py'