FEAT: Precomputed calibration model

This MR adds a new Precomputed calibration model. The idea of this is to use a set of precomputed calibration realisations and sample in the index of the line rather than the underlying model parameters.

This is similar to the method proposed in https://arxiv.org/abs/2009.10192 and has two advantages over the current method:

• only one new parameter per detector, rather than the standard 20 with the cubic spline.
• it can incorporate the physical calibration model described in the paper above.

I branched this from !1201 (merged) so the changes are a little confusing, but the new code, is essentially just the Precomputed class.

added 10-100 lines label

changed milestone to %2.0.0

added 5 commits

• 9bd97a82...ee78d544 - 4 commits from branch master
• ab310d0c - Merge branch 'master' into 'precomputed-calibration'

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added 6 commits

• ab310d0c...6c73e287 - 5 commits from branch master
• 0a4c0110 - Merge branch 'master' into 'precomputed-calibration'

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requested review from @gregory.ashton, @sylvia.biscoveanu, @michael.williams, @soichiro.morisaki, and @ethan.payne

This looks good, but I can't seem to approve the MR. Can someone please approve on my behalf?

approved this merge request

added 3 commits

• 0a4c0110...e98c55e8 - 2 commits from branch master
• 6151a791 - Merge branch 'master' into 'precomputed-calibration'

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approved this merge request

resolved all threads

I reduced the required number of approvals as there have been no changes since @gregory.ashton last approved.

merged

mentioned in commit 6237355a

mentioned in merge request bilby_pipe!513 (merged)