Support for aperiodic SRS at gNB

Francesco Manirequested to merge
aperiodic_SRS into develop

Add support for aperiodic SRS, which currently, if activated, is hardcoded to be periodically scheduled every 160 TTIs. The configuration file has been changed, and instead of

do_SRS = 0/1

is now

do_SRS = "none"/"periodic"/"aperiodic"
Edited by Robert Schmidt

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