fix: expose VyperSourceLocation fields #1255

Job	Run time
clippy	58s
doctest	1m 25s
feature-checks	4m 27s
docs	1m 20s
fmt	13s
test stable (macos-latest)	2m 20s
test stable --all-features (ubuntu-latest)	2m 2s
test 1.88 (macos-latest)	3m 35s
test 1.88 (ubuntu-latest)	1m 20s
test stable (windows-latest)	4m 2s
test stable --all-features (macos-latest)	2m 37s
test stable --all-features (windows-latest)	4m 48s
Analyze (actions)	54s
test 1.88 (windows-latest)	3m 13s
test stable (ubuntu-latest)	1m 21s
deny / cargo deny check	19s
ci-success	2s
	34m 56s

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