Exposes more LFMCMC methods and updates epiworld

[gvegayon]

This pull request includes several significant updates to the epiworldR package, focusing on the LFMCMC model, namespace management, and versioning. The changes improve the functionality and robustness of the package, particularly in the handling of the LFMCMC model.

Versioning and Package Information:

• Updated the package version from 0.4-3 to 0.5-0 in the DESCRIPTION file.
• Updated the versioning macros in inst/include/epiworld/epiworld.hpp to reflect the new version 0.5.0.

Namespace Management:

• Removed several S3method entries related to epiworld_lfmcmc from the NAMESPACE file. [1] [2]
• Added new export entries for functions related to LFMCMC such as get_accepted_params, get_accepted_stats, and others in the NAMESPACE file. [1] [2] [3]

LFMCMC Model Enhancements:

• Introduced the stopifnot_lfmcmc function to validate LFMCMC objects in R/LFMCMC.R.
• Refactored several methods in R/LFMCMC.R to include stopifnot_lfmcmc checks, ensuring that the input is a valid LFMCMC object. [1] [2]
• Added new functions in R/LFMCMC.R to retrieve accepted parameters, statistics, and other related data from the LFMCMC model.
• Updated the print method in R/LFMCMC.R to include a burnin parameter for discarding initial samples.
• Expanded test-lfmcmc.R to cover the above enhancements

C++ Backend Adjustments:

• Updated the LFMCMC class in inst/include/epiworld/math/lfmcmc/lfmcmc-bones.hpp to include new methods for retrieving accepted parameters and statistics.
• Modified the print method in inst/include/epiworld/math/lfmcmc/lfmcmc-meat-print.hpp to handle the burnin parameter.
• Adjusted the run method in inst/include/epiworld/math/lfmcmc/lfmcmc-meat.hpp to improve parameter handling and kernel function calls. [1] [2]

Miscellaneous Improvements:

• Updated template defaults in several header files to use EPI_DEFAULT_TSEQ instead of specific types. [1] [2] [3] [4]
• Improved error messages in inst/include/epiworld/model-meat.hpp for better clarity.

These changes collectively enhance the usability, reliability, and maintainability of the epiworldR package, particularly in the context of the LFMCMC model.

[apulsipher]

looks good so far. I'm going to merge in the latest from the C++ library and fix the failing tests

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 9 lines in your changes missing coverage. Please review.

Project coverage is 36.15%. Comparing base (cc673d1) to head (44a40a7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
R/LFMCMC.R	87.23%	6 Missing ⚠️
src/lfmcmc.cpp	84.21%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
+ Coverage   34.82%   36.15%   +1.32%     
==========================================
  Files          36       36              
  Lines        1921     1975      +54     
==========================================
+ Hits          669      714      +45     
- Misses       1252     1261       +9     

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