feat: Forward Message - Base structure implementation

[rolsonquadras]

• Base structure for Forward Message type

closes #957

Signed-off-by: Rolson Quadras [email protected]

[codecov]

Codecov Report

Merging #990 into master will decrease coverage by 0.03%.
The diff coverage is 93.93%.

@@            Coverage Diff             @@
##           master     #990      +/-   ##
==========================================
- Coverage   90.95%   90.91%   -0.04%     
==========================================
  Files          90       90              
  Lines        5758     5788      +30     
==========================================
+ Hits         5237     5262      +25     
- Misses        282      285       +3     
- Partials      239      241       +2

Impacted Files	Coverage Δ
pkg/didcomm/protocol/route/service.go	87.61% <100%> (-1.4%)	⬇️
pkg/didcomm/dispatcher/outbound.go	84.31% <87.5%> (+1.45%)	⬆️

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