allow setting remappings on lsp server init

[chrisfarms]

What

enables client's of the lsp server to configure remappings during the initialisation command.

we already allow configuring import-paths through the initialisation, so hopefully this is not controversial.

the format expected to be passed in from the initialise json is:

{ 
  "remappings": [
      {context: "", prefix: "foo", target: "bar"},
      ...
  ]
}

Why

Because without being able to set remappings, the lsp-server throws errors for any project that requires them.

Related

• https://github.com/ethereum/solidity/issues/12603
• https://github.com/ethereum/solidity/pull/12994

[christianparpart]

Many thanks for your contribution @chrisfarms. We will take a close look at your work. :)

[chrisfarms]

Thanks, addressed your review comments.

Will take a look at the lsp.py tests shortly (had not spotted those tests) 👍

[chrisfarms]

added a very basic case to the python lsp tests

[Marenz]

I rebased the PR to the latest develop branch to fix the pylint CI failure

[christianparpart]

@chrisfarms I have been taking over this PR to finish the review, simply applying @leonardoalt's comments & adding a changelog item. I hope you don't mind.

[chrisfarms]

@chrisfarms I have been taking over this PR to finish the review, simply applying @leonardoalt's comments & adding a changelog item. I hope you don't mind.

🙏 don't mind at all, thanks!

[christianparpart]

Adding @cameel for the final review.

[cameel]

Does this fix #12603? If so, please add #Fixes #12603 in the PR description.

Also needs rebase on latest develop and approvals from @christianparpart and @leonardoalt.

[nikola-matic]

Rebased and resolved conflicts, should be in a more workable state now.

[NunoFilipeSantos]

Right now, we're choosing to close this PR as we won't allocate any time to this particular area.