[native] Add support for DEPENDENCY_DIR, INSTALL_PREFIX, PYTHON_VENV

[majetideepak]

Description

DEPENDENCY_DIR and INSTALL_PREFIX help developers manage dependencies.
PYTHON_VENV is used to configure the clang-format package.

Motivation and Context

Impact

Test Plan

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[czentgr]

Thank you!
Please update the release section in the PR description.

[steveburnett]

Thanks for the doc! A couple of minor nits, and a suggestion to rephrase for easier understanding.

[majetideepak]

@steveburnett can you take another look? Thanks.

[czentgr]

Looks good.

[steveburnett]

LGTM! (docs)

[majetideepak]

@tdcmeehan can you please help approve and merge this? Thanks.
This needs a committer approval due to the changes to .gitignore.