Extend manifest with chain exchange configuration

[masih]

Add chain exchange configuration to the manifest along with validation.

Part of #792

[codecov]

Codecov Report

Attention: Patch coverage is 26.92308% with 19 lines in your changes missing coverage. Please review.

Project coverage is 68.61%. Comparing base (fbd674a) to head (9a2a898).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
manifest/manifest.go	26.92%	16 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #810      +/-   ##
==========================================
- Coverage   68.82%   68.61%   -0.21%     
==========================================
  Files          81       81              
  Lines        8281     8307      +26     
==========================================
+ Hits         5699     5700       +1     
- Misses       2096     2117      +21     
- Partials      486      490       +4     

Files with missing lines	Coverage Δ
manifest/manifest.go	49.47% <26.92%> (-3.58%)	⬇️

... and 7 files with indirect coverage changes