some f32 fixes, bump dppl compat, some refactoring of init params for LDF samplers

[penelopeysm]

hodgepodge of stuff but it's 4am so i'm going to dump this here without any further comment

[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.42%. Comparing base (35d1b18) to head (a139280).

Files with missing lines	Patch %	Lines
src/mcmc/external_sampler.jl	0.00%	2 Missing ⚠️
ext/TuringDynamicHMCExt.jl	0.00%	1 Missing ⚠️
src/mcmc/hmc.jl	90.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (35d1b18) and HEAD (a139280). Click for more details.

HEAD has 15 uploads less than BASE

Flag	BASE (35d1b18)	HEAD (a139280)
	23	8

Additional details and impacted files

@@              Coverage Diff              @@
##           breaking    #2793       +/-   ##
=============================================
- Coverage     86.44%   41.42%   -45.03%     
=============================================
  Files            22       22               
  Lines          1446     1422       -24     
=============================================
- Hits           1250      589      -661     
- Misses          196      833      +637     

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[penelopeysm]

superseded