New Feature: lock only `conda-lock` dependencies in `pyproject.toml`

[pep-sanwer]

This introduces a new flag for pyproject.toml-based specification (affecting all flavors of pyproject.toml) that skips locking / solving for all dependencies not found under [tool.conda-lock].

This allows use-cases where a user wants conda-lock locking for only conda dependencies, while bringing their own locker for other dependencies. (My preferred workflow is conda-lock for venv management / management of any non-pip-able deps, followed by poetry for pip-able deps).

The flag is exposed as:

[tool.conda-lock]
skip-non-conda-lock = true

The below example pyproject.toml:

[tool.poetry]
name = "conda-lock-test-poetry"
version = "0.0.1"
description = ""
authors = ["conda-lock"]

[tool.poetry.dependencies]
python = "^3.7"
pandas = "*"
numpy = "*"

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

[tool.conda-lock]
channels = [
    'defaults'
]
skip-non-conda-lock = true

[tool.conda-lock.dependencies]
python = "3.11"
sqlite = "<3.34"
certifi = ">=2019.11.28"

would result in conda-lock only producing a lockfile for python, sqlite, and certifi, skipping pandas and numpy.

Again, deeply appreciative of this incredible tool, and for your time in reviewing this PR. Very open to suggestions / refinements.

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[pep-sanwer]

@maresb, great catch! Completely forgot tests for the other flavors! Yes you are right, this does apply across all flavors of pyproject.toml. Requested changes amended into commit! (Requested changes in above force push, typo fixes in below force push). Additionally added missing requires-python in flit test pyproject.tomls.

Appreciate the incredibly speedy feedback!