Declare in corresponding header files and dissolve main.h (#3796)

* Declare in corresponding header files and dissolve main.h

Apply include-what-you-use

* Remove further unncessary includes

* Incorporate review comment

* Do not declare static functions and variables in header

* Adapt test

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/commands/CmdInfo.cpp

@@ -34,9 +34,9 @@
 #include <Filter.h>
 #include <Lexer.h>
 #include <Operation.h>
+#include <feedback.h>
 #include <format.h>
-#include <main.h>
-#include <math.h>
+#include <rules.h>
 #include <shared.h>
 #include <stdlib.h>
 #include <taskchampion-cpp/lib.h>