feat: classes for common secret types (#473)

This PR adds custom classes for the following secret types:

- service account token secrets
- basic authentication secrets
- tls secrets
- ssh authentication secrets
- docker config secrets

Closes #344

Signed-off-by: Christopher Rybicki <rybickic@amazon.com>
(cherry picked from commit 716fb13)

# Conflicts:
#	docs/java.md
#	docs/python.md
#	docs/typescript.md

Author: Chriscbr