Refactor: Refactor the RadasReceiver

[ligangty]

• Support timeout mechanism for Receiver exit

[coveralls]

Pull Request Test Coverage Report for Build 15457448083

Details

• 51 of 62 (82.26%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+1.2%) to 66.576%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
charon/config.py	2	3	66.67%
charon/pkgs/radas_sign.py	49	59	83.05%

Files with Coverage Reduction	New Missed Lines	%
charon/pkgs/radas_sign.py	1	85.4%

Totals
Change from base Build 15442769287:	1.2%
Covered Lines:	2213
Relevant Lines:	3324

---

💛 - Coveralls

[yma955]

LGTM