Move run and redfish to compile units

Meson supports unity builds[1] natively. There's no reason to continue
with the pseudo unity build we've been using by putting implementations
in header files.

Move run and redfish to compile units

Meson supports unity builds[1] natively. There's no reason to continue
with the pseudo unity build we've been using by putting implementations
in header files.

This commit is the first in a long series of starting to break this up
into smaller compile units, in the hopes of dropping incremental compile
times for developers, and reduce the total per-core memory usage that
gcc requires.

This commit breaks out the run() function from main() and the
constructor of RedfishService from redfish.hpp into their own compile
units. According to tracing, even after broken out, these are still by
far the two longest to compile units in the build.

Tested: Code compiles. Debug build on a 24 core build server results in
a decrease in compile time for compiling just bmcweb from 1m38s to
1m22s.

[1] https://mesonbuild.com/Unity-builds.html

Change-Id: Ibf352e8aba61d64c9a41a7a76e94ab3b5a0dde4b
Signed-off-by: Ed Tanous <ed@tanous.net>

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