apc_modbus: decode RunTimeCalibrationStatus_BF

[EchterAgo]

RunTimeCalibrationStatus_BF is explained in MPAO-98KJ7F_R1_EN Appendix B.

This adds defines for the bitfield and decodes it into experimental.ups.calibration.result using a string join converter.

Depends on #3413

General points

• Described the changes in the PR submission or a separate issue, e.g.
  known published or discovered protocols, applicable hardware (expected
  compatible and actually tested/developed against), limitations, etc.

• There may be multiple commits in the PR, aligned and commented with
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  separate PR, but certainly in a dedicated commit to simplify reviews
  of "real" changes in the other commits. Similarly for typo fixes in
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Frequent "underwater rocks" for driver addition/update PRs

• Revised existing driver families and added a sub-driver if applicable
  (nutdrv_qx, usbhid-ups...) or added a brand new driver in the other
  case.

• Did not extend obsoleted drivers with new hardware support features
  (notably blazer and other single-device family drivers for Qx protocols,
  except the new nutdrv_qx which should cover them all).

• For updated existing device drivers, bumped the DRIVER_VERSION macro
  or its equivalent.

• For USB devices (HID or not), revised that the driver uses unique
  VID/PID combinations, or raised discussions when this is not the case
  (several vendors do use same interface chips for unrelated protocols).

• For new USB devices, built and committed the changes for the
  scripts/upower/95-upower-hid.hwdb file

• Proposed NUT data mapping is aligned with existing docs/nut-names.txt
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  experimental.* namespace can be used as documented there, and discussion
  should be raised on the NUT Developers mailing list to standardize the new
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• Updated data/driver.list.in if applicable (new tested device info)

Frequent "underwater rocks" for general C code PRs

• Did not "blindly assume" default integer type sizes and value ranges,
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• For newly added files, the Makefile.am recipes were updated and the
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General documentation updates

• Added a bullet point into NEWS.adoc, possibly also UPGRADING.adoc
  if there is something packagers or custom-build users should take into
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• Updated docs/acknowledgements.txt (for vendor-backed device support)

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Additional work may be needed after posting this PR

• Propose a PR for NUT DDL with detailed device data dumps from tests
  against real hardware (the more models, the better).

• Address NUT CI farm build failures for the PR: testing on numerous
  platforms and toolkits can expose issues not seen on just one system.

• Revise suggestions from LGTM.COM analysis about "new issues" with
  the changed codebase.

[github-actions]

A ZIP file with standard source tarball and another tarball with pre-built docs for commit 7341b41 is temporarily available: NUT-tarballs-PR-3416.zip.

[EchterAgo]

This is ready if CI goes through. I want to rebase after #3413 is merged.

[EchterAgo]

Rebased, ready for merge after CI.

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