Aurelien DARRAGON c614fd3b9f MINOR: log: add +cbor encoding option
In this patch, we make use of the CBOR (RFC8949) encode helper functions
from the previous commit to implement '+cbor' encoding option for log-
formats. The logic behind it is pretty similar to '+json' encoding option,
except that the produced output is a CBOR payload written in HEX format so
that it remains compatible to use this with regular syslog endpoints.

Example:
  log-format "%{+cbor}o %[int(4)] test %(named_field)[str(ok)]"

Will produce:
  BF6B6E616D65645F6669656C64626F6BFF

  Detailed view (from cbor.me):
    BF                           # map(*)
       6B                        # text(11)
          6E616D65645F6669656C64 # "named_field"
       62                        # text(2)
          6F6B                   # "ok"
       FF                        # primitive(*)

If the option isn't set globally, but on a specific node instead, then
only the value will be encoded according to CBOR specification.

Example:
  log-format "test cbor bool: %{+cbor}[bool(true)]"

Will produce:
  test cbor bool: F5
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The HAProxy documentation has been split into a number of different files for
ease of use.

Please refer to the following files depending on what you're looking for :

  - INSTALL for instructions on how to build and install HAProxy
  - BRANCHES to understand the project's life cycle and what version to use
  - LICENSE for the project's license
  - CONTRIBUTING for the process to follow to submit contributions

The more detailed documentation is located into the doc/ directory :

  - doc/intro.txt for a quick introduction on HAProxy
  - doc/configuration.txt for the configuration's reference manual
  - doc/lua.txt for the Lua's reference manual
  - doc/SPOE.txt for how to use the SPOE engine
  - doc/network-namespaces.txt for how to use network namespaces under Linux
  - doc/management.txt for the management guide
  - doc/regression-testing.txt for how to use the regression testing suite
  - doc/peers.txt for the peers protocol reference
  - doc/coding-style.txt for how to adopt HAProxy's coding style
  - doc/internals for developer-specific documentation (not all up to date)
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