add server endpoint for requesting samples filtered by a given haplotype

[Don-Isdale]

Requirements

This endpoint will extend on the existing genotypeSamples, which takes datasetId and scope as parameters and returns a list of sample names.
It will have an added parameter which is a list of SNPs identified by position, and for each SNP whether the genotype value of the sample should match Ref or Alt. The returned list of samples will be filtered to those Samples whose genotype value at each SNP matches the required value.

[Don-Isdale]

Changes Implemented

branch feature/vcfDownload

e4c0dbe Find Samples from selected haplotype

d353ac2 drop exports. in child-process

7c87f66 add vcfGenotypeSamplesFiltered
84400c4 update dependency and version

46c97c3 update dependency version and package-lock in lb4app

The commit e4c0dbe includes work done for the changes to the frontend GUI, identified in the sibling issue#485.

Test results

After making these changes, the genotypeSamples request with a filter parameter given resulted in a reduced list of sample names :

http://localhost:3000/api/Blocks/genotypeSamples?id=63184b7d4a9ec986e3530ed7&datasetId=..._samples_XT_exomeIDs&scope=1A&filter%5Bfeatures%5D%5B0%5D%5Bposition%5D=3904729&filter%5Bfeatures%5D%5B0%5D%5BmatchRef%5D=false&filter%5Bfeatures%5D%5B1%5D%5Bposition%5D=1337345&filter%5Bfeatures%5D%5B1%5D%5BmatchRef%5D=true

id=63184b7d4a9ec986e3530ed7
datasetId=..._samples_XT_exomeIDs
scope=1A
filter%5Bfeatures%5D%5B0%5D%5Bposition%5D=3904729
filter%5Bfeatures%5D%5B0%5D%5BmatchRef%5D=false
filter%5Bfeatures%5D%5B1%5D%5Bposition%5D=1337345
filter%5Bfeatures%5D%5B1%5D%5BmatchRef%5D=true

{"text":{"text":"ExomeCapture-...3928\n"}}

This is an early test result; in later versions a change was made to give just one level of {text : } wrapper.

Screenshot after above changes