Add random sample to guid

[jenshnielsen]

The current time resolution, especially on windows, is insufficient to ensure that we always avoid collisions in guids. Since sample names are available within the dataset metadata and the sample part of the guid is cumbersome to use I suggest that we replace that with a random string.

The broad plan is

• Make guid type configurable
• Warn if the sample name guid is set to something other than the default value.
• Update tests that have problems with guid collisions to use the new guid type
• Eventually change the default to the new type

For now we ami to completely remove the support of setting a sample_id. If actual use shows up we are open to allow this to be enabled as an explicit option

[jenshnielsen]

resolves #4504

[codecov]

Codecov Report

Merging #4763 (95e8cd1) into master (0df4520) will decrease coverage by 0.92%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master    #4763      +/-   ##
==========================================
- Coverage   68.20%   67.28%   -0.93%     
==========================================
  Files         339      339              
  Lines       32003    32016      +13     
==========================================
- Hits        21828    21541     -287     
- Misses      10175    10475     +300     

[astafan8]

to the open question: i agree, it might not be worth the effort to have 3 options, my hope is that due to lack of advertizing not many users used the guid customization.

[jenshnielsen]

Todo

• Add suitable warnings to loading by sample
• Check that docs are up to date

[jenshnielsen]

@astafan8 should be ready for a real review