swapped back to using Futures

[evvaaaa]

[:)] python -m fastcs_eiger ioc EIGER
INFO: PVXS QSRV2 is loaded, permitted, and ENABLED.
2024-11-18T16:13:59.846533809 WARN pvxs.tcp.setup Server unable to bind port 5075, falling back to [::]:37927
Starting iocInit
############################################################################
## EPICS 7.0.7.0
## Rev. 7.0.7.99.0.2
## Rev. Date 7.0.7.99.0.2
############################################################################
`update` AFTER 0.3049039840698242
`update` AFTER 0.41122913360595703

Futures start at the right time, and closing them with stop_scan_futures works the same way.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.56%. Comparing base (f822afa) to head (8fe8a89).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fastcs/backend.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   82.54%   82.56%   +0.01%     
==========================================
  Files          23       23              
  Lines         934      935       +1     
==========================================
+ Hits          771      772       +1     
  Misses        163      163              

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[jsouter]

Seems good, fastcs-eiger scan tasks/futures start up quickly again now