single result file per sample if given {record_identifier} in the result_file_path

[donaldcampbelljr]

Allow pipestat to use a single result file per sample if given {record_identifier} in the result_file_path.

Then, if multiple result files are used, summarize, table, and link will search for the result.yaml files, aggregate them and use the aggregated results.

Related to:
#120
databio/pepatac#257
databio/pepatac#256

[codecov]

Codecov Report

Attention: 40 lines in your changes are missing coverage. Please review.

Comparison is base (76d79d9) 34.13% compared to head (03d7d1a) 34.06%.
Report is 2 commits behind head on dev.

❗ Current head 03d7d1a differs from pull request most recent head 17563fd. Consider uploading reports for the commit 17563fd to get more accurate results

Files	Patch %	Lines
pipestat/backends/file_backend/filebackend.py	19.04%	17 Missing ⚠️
pipestat/helpers.py	16.66%	10 Missing ⚠️
pipestat/pipestat.py	47.05%	9 Missing ⚠️
pipestat/reports.py	0.00%	3 Missing ⚠️
pipestat/backends/abstract.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #123      +/-   ##
==========================================
- Coverage   34.13%   34.06%   -0.08%     
==========================================
  Files          21       21              
  Lines        3269     3323      +54     
==========================================
+ Hits         1116     1132      +16     
- Misses       2153     2191      +38     

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