Rename transformed (Update for Measure terminology)

[Micki-D]

Updates the original PR #409 with the new measure terminology.

[Micki-D]

So the failing tests are due to errors in the generation of viable MCMC chains.
But I am unsure if this is due to issues with the Measure terminology or due to issues in the original PR #409.
Were there any known issues with the transformed MCMC algorithms @Cornelius-G ? Thanks!

[Micki-D]

Also, @oschulz is there a convention for when to use 'X_density' or 'X_measure' or 'm' as variable names?
It's unclear to me from the existing code.
Thanks!

[codecov]

Codecov Report

Attention: Patch coverage is 9.83146% with 642 lines in your changes missing coverage. Please review.

Project coverage is 42.60%. Comparing base (67ac2bf) to head (427481f).
Report is 2 commits behind head on main.

❗ Current head 427481f differs from pull request most recent head 189c285

Please upload reports for the commit 189c285 to get more accurate results.

Files	Patch %	Lines
src/samplers/transformed_mcmc/mcmc_iterate.jl	0.00%	126 Missing ⚠️
src/samplers/transformed_mcmc/chain_pool_init.jl	0.00%	111 Missing ⚠️
src/samplers/transformed_mcmc/mcmc_convergence.jl	0.00%	56 Missing ⚠️
src/samplers/transformed_mcmc/mcmc_stats.jl	0.00%	56 Missing ⚠️
...sformed_mcmc/mcmc_tuning/mcmc_proposalcov_tuner.jl	0.00%	54 Missing ⚠️
src/samplers/transformed_mcmc/proposaldist.jl	0.00%	43 Missing ⚠️
...rc/samplers/transformed_mcmc/multi_cycle_burnin.jl	0.00%	37 Missing ⚠️
src/samplers/transformed_mcmc/mcmc_algorithm.jl	0.00%	30 Missing ⚠️
...ers/transformed_mcmc/mcmc_tuning/mcmc_ram_tuner.jl	0.00%	30 Missing ⚠️
src/samplers/transformed_mcmc/mcmc_sample.jl	0.00%	29 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #441      +/-   ##
==========================================
- Coverage   47.26%   42.60%   -4.67%     
==========================================
  Files         111      127      +16     
  Lines        5385     6068     +683     
==========================================
+ Hits         2545     2585      +40     
- Misses       2840     3483     +643     

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