feat(rpc): adding daser stub for friendly API error

[distractedm1nd]

Closes #1299 and #304

[codecov-commenter]

Codecov Report

Merging #1308 (59809a5) into main (f5f5adb) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1308      +/-   ##
==========================================
+ Coverage   54.83%   55.07%   +0.24%     
==========================================
  Files         176      176              
  Lines       10552    10545       -7     
==========================================
+ Hits         5786     5808      +22     
+ Misses       4194     4159      -35     
- Partials      572      578       +6     

Impacted Files	Coverage Δ
nodebuilder/das/mocks/api.go	26.66% <ø> (ø)
nodebuilder/fraud/mocks/api.go	12.50% <ø> (ø)
nodebuilder/header/mocks/api.go	12.50% <ø> (ø)
nodebuilder/node.go	60.31% <ø> (ø)
nodebuilder/share/mocks/api.go	8.16% <ø> (ø)
nodebuilder/state/mocks/api.go	11.45% <ø> (ø)
nodebuilder/das/daser.go	100.00% <100.00%> (ø)
nodebuilder/das/module.go	95.12% <100.00%> (+0.52%)	⬆️
nodebuilder/rpc/module.go	91.66% <100.00%> (-2.93%)	⬇️
nodebuilder/rpc/rpc.go	100.00% <100.00%> (ø)
... and 4 more

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[Wondertan]

LG