feat: Add stream option to limit inbound message size

[g11tech]

If the size is not provided decode from it-length-prefixed lib applies the ~4mb limit by default:
From npm docs:

maxDataLength: If provided, will not decode messages whose data section exceeds the size specified, if omitted will use the default of 4MB.

bellatrix message sizes could be 10MB so this limit needs to be exposed via options so they can be set by lodestar

[codecov-commenter]

Codecov Report

Base: 83.22% // Head: 83.58% // Increases project coverage by +0.36% 🎉

Coverage data is based on head (5d6bcc8) compared to base (19507d9).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #349      +/-   ##
==========================================
+ Coverage   83.22%   83.58%   +0.36%     
==========================================
  Files          47       47              
  Lines       11713    11771      +58     
  Branches     1258     1267       +9     
==========================================
+ Hits         9748     9839      +91     
+ Misses       1965     1932      -33     

Impacted Files	Coverage Δ
src/index.ts	70.37% <100.00%> (+1.31%)	⬆️
src/stream.ts	97.33% <100.00%> (+0.27%)	⬆️
test/gossip.spec.ts	96.31% <100.00%> (+0.73%)	⬆️

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[g11tech]

I think i will need to fix the tests since the pubsub reference has changed, let me update and push

[g11tech]

@dapplion ready for merge!