cmake: add a component for each binary
This makes it possible to build/install only the desired binaries regardless of the configuration.
For consistency, the component names match the binary names. Kernel
and GUI
have been renamed.
Additionally it fixes #31762 by installing only the manpages for the configured targets (and includes them in the component installs for each).
Also fixes #31745.
Alternative to #31765 which is (imo) more correct/thorough.
Can be tested using (for ex):
$ cmake -B build
$ cmake --build build -t bitcoind -t bitcoin-cli
$ cmake --install build --component bitcoind
$ cmake --install build --component bitcoin-cli