add legate-boost conda packages

[jameslamb]

Description

For #101 , we want to publish legate-boost conda packages to the legate channel (https://anaconda.org/legate/repo).

This captures the work to do that.

Benefits of this work

• simplifies installation of legate-boost

Acceptance Criteria

• conda packages are built and tested in CI here
• conda package name should be legate-boost (with the -)
• pushing a tag to the repo triggers publishing to the legate conda channel

Approach

Patterns that might be borrowed from RAPIDS libraries, including:

• pyproject.toml instead of setup.py
• scikit-build-core as a build backend instead of scikit-build
• rapids-cmake to manage dependencies
• rapids-dependency-file-generator to keep different lists of dependencies consistent

For an example of this, see how cuvs conda packages are built:

• https://github.com/rapidsai/cuvs/blob/branch-24.08/conda/recipes/cuvs/meta.yaml
• https://github.com/rapidsai/cuvs/blob/branch-24.08/build.sh
• https://github.com/rapidsai/cuvs/blob/branch-24.08/python/cuvs/pyproject.toml

Notes

legate-core source, for reference: https://github.com/nv-legate/legate.core