feat: Add license Apache-2.0 #4026

Job	Run time
deny	22s
rustfmt	13s
clippy	49s
check (ubuntu-latest)	1m 56s
codegen	23s
doc-test	1m 13s
check (macOS-latest)	2m 21s
Interop Tests (ubuntu-latest)	36s
check (windows-latest)	4m 17s
msrv	44s
Interop Tests (macOS-latest)	1m 5s
test (ubuntu-latest)	1m 41s
test (macOS-latest)	1m 53s
Interop Tests (windows-latest)	2m 34s
udeps	3m 54s
test (windows-latest)	3m 14s
external-types	39s
semver	1m 12s
	29m 6s

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