[BUG] `oauth_signature` not encoded in versions 1.2.0 and 1.3.0

[ech0s7r]

Bug Report Checklist

• [x] Have you provided a code sample to reproduce the issue?
• [x] Have you tested with the latest release to confirm the issue still exists?
• [x] Have you searched for related issues/PRs?
• [x] What's the actual output vs expected output?

PR opened to fix the issue: https://github.com/Mastercard/oauth1-signer-python/pull/34

Description Requests are rejected when signed with the python library mastercard-oauth1-signer versions 1.2.0 and 1.3.0. The oauth_signature is not encoded as per https://datatracker.ietf.org/doc/html/rfc3986#section-2.1.

See the OAuth#getAuthorizationHeader implementation in oauth1-signer-java as reference:

...
// Signature
String signature = signSignatureBaseString(sbs, signingKey, charset);
oauthParams.put("oauth_signature", Util.percentEncode(signature, charset));
...

To Reproduce

1. Make a request using version 1.2.0 or 1.3.0
2. The oauth_signature in the Authorization header is not encoded
3. Note the generated oauth_signature param: GgLIi0W5+prHjxJHTLJuXKQZemxnJEdThw0y0nqQjFaDOwfgQqHw8C/3JReZ0AffrBtI2rs6I1xQk74hMOPoiAsQsIPO7pQ7vZlEk1nO3nO6uXebZ/tu2k0KLpwqYzBULAnuVZuhfSQG7oEI3qGbtI5u/tAv4P64zLY/vl36NB+KSYqONPBx04T12mk/rk1Xswh3aVEtXzycOvRHB+/3ydavXgGzHSg9WpzkyyQ4YmJajGcNwVZWgJGNl9ectr9KBrL6PmxHyS1fRI/aabEH6uFy3gGk9d4IMwm1hsU+Pwq0pS3AnBZpo26YpwVMDmyaoq5GmBZGUFONOiPNgQAwAg==

Expected behavior

• The gateway accepted oauth_signature as computed by the oauth1-signer-java: GgLIi0W5%2BprHjxJHTLJuXKQZemxnJEdThw0y0nqQjFaDOwfgQqHw8C%2F3JReZ0AffrBtI2rs6I1xQk74hMOPoiAsQsIPO7pQ7vZlEk1nO3nO6uXebZ%2Ftu2k0KLpwqYzBULAnuVZuhfSQG7oEI3qGbtI5u%2FtAv4P64zLY%2Fvl36NB%2BKSYqONPBx04T12mk%2Frk1Xswh3aVEtXzycOvRHB%2B%2F3ydavXgGzHSg9WpzkyyQ4YmJajGcNwVZWgJGNl9ectr9KBrL6PmxHyS1fRI%2FaabEH6uFy3gGk9d4IMwm1hsU%2BPwq0pS3AnBZpo26YpwVMDmyaoq5GmBZGUFONOiPNgQAwAg%3D%3D

[ech0s7r]

Closed with #34.