build: add build of separate plugins

[cejkato2]

Build separate .so - loadable objects and include them into separate RPM packages.

[codecov-commenter]

Codecov Report

Base: 49.41% // Head: 16.87% // Decreases project coverage by -32.53% :warning:

Coverage data is based on head (2325e7f) compared to base (d87fca1). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #106       +/-   ##
===========================================
- Coverage   49.41%   16.87%   -32.54%     
===========================================
  Files          82        2       -80     
  Lines        8046      948     -7098     
===========================================
- Hits         3976      160     -3816     
+ Misses       4070      788     -3282     

Flag	Coverage Δ
tests	16.87% <ø> (-32.54%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pluginmgr.cpp
input/pcap.hpp
include/ipfixprobe/packet.hpp
storage/cache.hpp
process/dnssd.cpp
include/ipfixprobe/process.hpp
process/ovpn.cpp
output/text.hpp
output/unirec.hpp
options.cpp
... and 71 more

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