[WIP] Unpack idaes-local tar file in get-extensions command

[Robbybp]

Fixes

Part of IDAES/idaes-ext#261

Summary/Motivation:

Make CyIpopt as easy to use as possible.

Changes proposed in this PR:

• After unpacking idaes-solvers-<os>.tar.gz into .idaes/bin, unpack idaes-local-<os>.tar.gz (which is included in idaes-solvers) into .idaes

Opening as a WIP as there are some unresolved details:

• Current implementation assumes that the parent directory of the "install-to directory" is writable (and the correct place to unpack idaes-local). I'm not sure what the best way to specify this directory is.
• Implementation could probably be streamlined if we distributed idaes-local-<os>.tar.gz on the downloads page of idaes-ext (instead of inside the idaes-solvers tar file)
• We currently distribute idaes-local for MacOS as idaes-local-darwin-arm64.tar.gz, which is inconsistent with all the other tar files distributed for MacOS (which are *-darwin-aarch64.tar.gz). I would recommend changing this in idaes-ext

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[ksbeattie]

@Robbybp is this expected for the Nov release? If so we should find a time to coordinate it, if you can't make it to the dev calls.

[Robbybp]

I'm going to close this for now. Once IDAES/idaes-ext#262 is merged, we will need to cut an idaes-ext release. At approximately the same time, I will re-open this PR (and probably combine it with an idaes install cyipopt command). While this PR could go forward as-is, it will need to be rewritten once IDAES/idaes-ext#262 is merged, and the benefit of unpacking the idaes-local tar file will not be realized until then either.

@ksbeattie As to whether this is expected for the Nov release, it depends on how long it takes us to get IDAES/idaes-ext#262 merged. My preference would be to get this in, but I will be at a conference next week and probably not able to work on IDAES/idaes-ext#262 until I'm back, so I'd say it's a toss-up.