Prefactor PaymentParameters for blinded recipients

[valentinewallace]

Several pay params fields are specific to either blinded or unblinded recipients, so here we use an enum to separate the two cases and ensure that an invalid PaymentParameters can't be created.

[codecov-commenter]

Codecov Report

Patch coverage: 83.82% and project coverage change: -0.01 ⚠️

Comparison is base (2cae6f0) 91.58% compared to head (fb9983c) 91.57%.

❗ Current head fb9983c differs from pull request most recent head a84e832. Consider uploading reports for the commit a84e832 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2258      +/-   ##
==========================================
- Coverage   91.58%   91.57%   -0.01%     
==========================================
  Files         104      105       +1     
  Lines       51993    60983    +8990     
  Branches    51993    60983    +8990     
==========================================
+ Hits        47616    55848    +8232     
- Misses       4377     5135     +758     

Impacted Files	Coverage Δ
lightning/src/ln/features.rs	97.25% <0.00%> (-1.21%)	⬇️
lightning/src/ln/channelmanager.rs	91.20% <25.00%> (+2.40%)	⬆️
lightning/src/routing/router.rs	94.45% <83.22%> (-0.64%)	⬇️
lightning/src/ln/payment_tests.rs	97.57% <92.85%> (-0.01%)	⬇️
lightning-invoice/src/payment.rs	89.11% <100.00%> (ø)
lightning-invoice/src/utils.rs	97.17% <100.00%> (ø)
lightning/src/ln/functional_test_utils.rs	94.90% <100.00%> (+2.11%)	⬆️
lightning/src/ln/functional_tests.rs	98.25% <100.00%> (ø)
lightning/src/ln/onion_route_tests.rs	98.26% <100.00%> (ø)
lightning/src/ln/priv_short_conf_tests.rs	97.59% <100.00%> (ø)
... and 1 more

... and 18 files with indirect coverage changes

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[TheBlueMatt]

Basically LGTM.

[TheBlueMatt]

Basically lgtm, a few logging nits.