Allow decimal numbers for 'cpuCores'

[peio-burucoa]

We're facing a case where we would like to use 0.5 CPU for a task, it would be great to replace the type of cpuCores by Double instead of Long:

tesk-api/src/main/java/uk/ac/ebi/tsc/tesk/tes/model/TesResources.java

Line 18 in c4494e5

private Long cpuCores;