rec and dnsdist: Move to yaml_serde

[omoerbeek]

Short description

See #17710, no more dependency on a deprecated and an unsafe crate with this drop-in replacement.

Checklist

I have:

• read the CONTRIBUTING.md document
• read and accepted the Developer Certificate of Origin document, including the AI Policy, and added a "Signed-off-by" to my commits
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)

[coveralls]

Coverage Report for CI Build 33054850355

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage increased (+0.007%) to 71.183%

Details

• Coverage increased (+0.007%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 58 coverage regressions across 13 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

58 previously-covered lines in 13 files lost coverage.

Top 10 Files by Coverage Loss	Lines Losing Coverage	Coverage
pdns/recursordist/rec-system-resolve.cc	19	49.32%
pdns/recursordist/test-syncres_cc1.cc	11	80.03%
pdns/dnsdistdist/dnsdist-tcp.cc	5	74.46%
pdns/packethandler.cc	4	69.03%
pdns/iputils.cc	3	61.32%
pdns/rcpgenerator.cc	3	89.44%
pdns/remote_logger.cc	3	56.8%
modules/godbcbackend/sodbc.cc	2	69.31%
modules/lmdbbackend/lmdbbackend.cc	2	72.32%
pdns/recursordist/recpacketcache.cc	2	82.35%

---

Coverage Stats

Relevant Lines:	173431
Covered Lines:	135364
Line Coverage:	78.05%
Relevant Branches:	82910
Covered Branches:	47106
Branch Coverage:	56.82%
Branches in Coverage %:	Yes
Coverage Strength:	6038848.65 hits per line

---

💛 - Coveralls

[rgacogne]

Thanks!