RM Synthesis code that could be combined with imaging one day

[Luke-Pratley]

RM measurement operator + example of 1d reconstruction + tests

[codecov-io]

Codecov Report

Merging #262 into development will increase coverage by 0.44%.
The diff coverage is 93.29%.

@@ Coverage Diff @@ ## development #262 +/- ## =============================================== + Coverage 86.46% 86.91% +0.44%  =============================================== Files 66 70 +4 Lines 6259 6602 +343 =============================================== + Hits 5412 5738 +326  - Misses 847 864 +17

Impacted Files	Coverage Δ
cpp/tests/rm_operator.cc	100% <100%> (ø)
cpp/purify/rm_kernel_integration.cc	100% <100%> (ø)
cpp/purify/rm_operators.cc	70% <70%> (ø)
cpp/purify/rm_operators.h	95.53% <95.53%> (ø)
cpp/purify/kernels.cc	61.17% <0%> (+3.52%)	⬆️

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[Luke-Pratley]

This is ready to merge!

[CosmoMatt]

hey @Luke-Pratley we're tidying up PR's for PURIFY, can you remember what the state of this PR is? It seems as though it's ready to go, provided a few conflicts?

[Luke-Pratley]

@CosmoMatt I think it is fine for it to be merged tbh. It is adjacent to the interferometric imaging, so I am not surprised it is mostly ready to be merged.