Extract resampling methods

[devmotion]

This PR extracts and tests the resampling methods.

[devmotion]

In my opinion, in a subsequent PR they should be changed to include explicit RNGs (somehow this is still missing...). I just wanted to only extract things in this PR.

[coveralls]

Pull Request Test Coverage Report for Build 396052745

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 41 of 55 (74.55%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+14.0%) to 14.047%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/resampling.jl	41	55	74.55%

Files with Coverage Reduction	New Missed Lines	%
src/container.jl	1	0.0%

Totals
Change from base Build 392069529:	14.0%
Covered Lines:	42
Relevant Lines:	299

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #15 (0ff041a) into master (143b580) will increase coverage by 14.04%.
The diff coverage is 74.54%.

@@             Coverage Diff             @@
##           master      #15       +/-   ##
===========================================
+ Coverage    0.00%   14.04%   +14.04%     
===========================================
  Files           2        4        +2     
  Lines         303      299        -4     
===========================================
+ Hits            0       42       +42     
+ Misses        303      257       -46     

Impacted Files	Coverage Δ
src/AdvancedPS.jl	100.00% <ø> (ø)
src/container.jl	0.00% <ø> (ø)
src/smc.jl	0.00% <ø> (ø)
src/resampling.jl	74.54% <74.54%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 143b580...e674961. Read the comment docs.

[yebai]

It looks all good! Happy to merge as-is given that there are no functional changes.