Add i18 beamline file

[stan-dot]

Fixes #709

Instructions to reviewer on how to test:

1. `dodal connect i181
2. Confirm thing all the listed devices connect

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}

[codecov]

Codecov Report

Attention: Patch coverage is 85.58559% with 16 lines in your changes missing coverage. Please review.

Project coverage is 94.54%. Comparing base (9bfa98f) to head (3fc0386).
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/dodal/devices/areadetector/adutils.py	15.38%	11 Missing ⚠️
src/dodal/devices/areadetector/adaravis.py	33.33%	2 Missing ⚠️
src/dodal/devices/areadetector/adsim.py	50.00%	1 Missing ⚠️
src/dodal/devices/i22/nxsas.py	0.00%	1 Missing ⚠️
src/dodal/devices/logging_ophyd_device.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #710      +/-   ##
==========================================
+ Coverage   94.49%   94.54%   +0.05%     
==========================================
  Files         110      111       +1     
  Lines        4376     4418      +42     
==========================================
+ Hits         4135     4177      +42     
  Misses        241      241              

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[stan-dot]

01.08.2024 11:32
dodal connect $BEAMLINE
Attempting connection to i18 (using dodal.beamlines.i18)
3 devices connected :
dcm
undulator
synchrotron

and the failing devices are
it, i0, xpress3, panda1, slits_1
we could skip those latter 4 and focus on the basic step scan plan

[stan-dot]

would need to make a fresh file too, this one got mangled with the merged main changes