Improve SDK bindings examples

[dani-garcia]

Type of change

- [ ] Bug fix
- [ ] New feature development
- [x] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

Updated all the samples to load access token, organization id and urls from env variables. This made it much easier to quickly test all the bindings. Also added one Java example.

[bitwarden-bot]

Checkmarx One – Scan Summary & Details – 3b4ed1d9-85f5-4565-af43-c44ca58c429d

New Issues

Severity	Issue	Source File / Package	Checkmarx Insight
	Privacy_Violation	/languages/java/Example.java: 12	Attack Vector
	Privacy_Violation	/languages/java/Example.java: 13	Attack Vector
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/SecretsClient.java: 40	Attack Vector

[Hinton]

CPP has a comment about removing to use defaults, the others miss it. We should try and be consistent

[dani-garcia]

Sounds good, I'm going to check that all the examples work correctly when not setting the URLs or setting them to null, we might need #370 for them all to work though.