sign, encryption key rotation

[jeevatkm]

• Encryption & Signature Key rotation for Cookie #233 session cookie
• Encryption & Signature Key rotation for Anti-CSRF #234 anti-csrf cookie
• Add SameSite cookie attribute support #242 samesite cookie attribute support

[codecov]

Codecov Report

Merging #243 into edge will increase coverage by 0.08%.
The diff coverage is 92.98%.

@@            Coverage Diff             @@
##             edge     #243      +/-   ##
==========================================
+ Coverage   85.58%   85.67%   +0.08%     
==========================================
  Files          94       94              
  Lines        7716     7746      +30     
==========================================
+ Hits         6604     6636      +32     
+ Misses        771      770       -1     
+ Partials      341      340       -1

Impacted Files	Coverage Δ
security/session/manager.go	76.81% <100%> (+0.69%)	⬆️
security/anticsrf/anti_csrf.go	90.24% <75%> (+0.24%)	⬆️
security/cookie/cookie.go	86.27% <93.61%> (+6.78%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b1a2826...2539f9d. Read the comment docs.