Add manual http interrupt for eiger trigger

[abbiemery]

The eiger in tickit-devices needs a manual handle to component interrupts for its trigger. This will enable that.

[codecov[bot]]

Codecov Report

Merging #176 (cb27318) into master (606686f) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   94.64%   94.65%   +0.01%     
==========================================
  Files          41       41              
  Lines        1306     1309       +3     
==========================================
+ Hits         1236     1239       +3     
  Misses         70       70              

Files Changed	Coverage Δ
src/tickit/adapters/http.py	100.00% <100.00%> (ø)
src/tickit/adapters/io/http_io.py	100.00% <100.00%> (ø)