Implement getstepsize() for NoAdaptation samplers

[penelopeysm]

Closes #2400

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 44.66%. Comparing base (c0a4ee9) to head (4a78972).

Files with missing lines	Patch %	Lines
src/mcmc/hmc.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2405      +/-   ##
==========================================
- Coverage   44.72%   44.66%   -0.06%     
==========================================
  Files          22       22              
  Lines        1554     1556       +2     
==========================================
  Hits          695      695              
- Misses        859      861       +2     

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[coveralls]

Pull Request Test Coverage Report for Build 12110614043

Details

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+6.6%) to 44.666%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/mcmc/hmc.jl	0	2	0.0%

Totals
Change from base Build 12110228665:	6.6%
Covered Lines:	695
Relevant Lines:	1556

---

💛 - Coveralls

[sunxd3]

make sense, but coverage is saying that the added function is not hit, is it making a mistake?

Also a bunch of test errors -- I thought they are not related, but might be?

[penelopeysm]

No idea why the coverage isn't right. I tried to rerun and it's no different...

Yeah the errors are Mooncake related so separate from this PR.