Light: Add helper methods to retrieve view and projection matrices

[Popov72]

No description provided.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Snapshot stored with reference name:
refs/pull/14598/merge

Test environment:
https://babylonsnapshots.z22.web.core.windows.net/refs/pull/14598/merge/index.html

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[Popov72]

The CI is failing with:

1 leak(s) found @ #T90MQ4#14

This is a test that draws lines, so there's no reason for my PR to affect it (anyway, the PR only adds two little helper methods, so it shouldn't impact anything).

[RaananW]

The CI is failing with:

1 leak(s) found @ #T90MQ4#14

This is a test that draws lines, so there's no reason for my PR to affect it (anyway, the PR only adds two little helper methods, so it shouldn't impact anything).

checking why this test is flaky. I am running it again.