Multi-component libmamba(py)?

[jaimergp]

conda-libmamba-solver only relies on the solver part of libmamba. It doesn't use any of the extraction routines, or the networking stack. Would it be possible to build libmamba in different chunks? Something like:

• libmamba-archive.so
• libmamba-network.so
• libmamba-solver.so
• libmamba-common.so

... plus the corresponding Python counterparts if needed.

The dependency tree is currently:

libmamba[1.5.8]
  ├─ fmt[10.2.1]
  │  └─ libcxx[18.1.8]
  ├─ libcxx already visited
  ├─ libarchive[3.7.4]
  │  ├─ libzlib[1.3.1]
  │  ├─ bzip2[1.0.8]
  │  ├─ lz4-c[1.9.4]
  │  │  └─ libcxx already visited
  │  ├─ xz[5.2.6]
  │  ├─ libiconv[1.17]
  │  ├─ libxml2[2.12.7]
  │  │  ├─ libzlib already visited
  │  │  ├─ xz already visited
  │  │  ├─ libiconv already visited
  │  │  └─ icu[75.1]
  │  ├─ zstd[1.5.6]
  │  │  └─ libzlib already visited
  │  ├─ openssl[3.3.1]
  │  │  └─ ca-certificates[2024.7.4]
  │  └─ lzo[2.10]
  ├─ zstd already visited
  ├─ openssl already visited
  ├─ libcurl[8.9.1]
  │  ├─ libzlib already visited
  │  ├─ zstd already visited
  │  ├─ openssl already visited
  │  ├─ libssh2[1.11.0]
  │  │  ├─ libzlib already visited
  │  │  └─ openssl already visited
  │  ├─ krb5[1.21.3]
  │  │  ├─ libcxx already visited
  │  │  ├─ openssl already visited
  │  │  └─ libedit[3.1.20191231]
  │  │     └─ ncurses[6.5]
  │  └─ libnghttp2[1.58.0]
  │     ├─ libcxx already visited
  │     ├─ libzlib already visited
  │     ├─ openssl already visited
  │     ├─ libev[4.33]
  │     └─ c-ares[1.33.1]
  ├─ libsolv[0.7.30]
  │  ├─ libcxx already visited
  │  └─ libzlib already visited
  ├─ reproc[14.2.4.post0]
  ├─ reproc-cpp[14.2.4.post0]
  │  ├─ libcxx already visited
  │  └─ reproc[14.2.4.post0]
  └─ yaml-cpp[0.8.0]
     └─ libcxx already visited

with libarchive and libcurl bringing most of the leaves. If I could have conda-libmamba-solver depend on simply libmambapy-solver then all those libraries won't be needed in the conda dependency tree.

Another side benefit is that we would diminish the ABI surface for errors like this conda-forge/libarchive-feedstock#69.

I know this is probably a big ask, and certainly not urgent, but I'll leave it here for reference.