chore: connect to wallet without node (wip)

[davidyuk]

by request of @zxq9

Discussion points:

• Seems that the networkId only need to ensure that aepp and wallet are connected to the same network, so in this case, it can be omitted on the aepp side.
• Can we agree on placeholders in an encoded transaction that the wallet should replace with actual values? Instead of doing high-level API between aepp and wallet

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.86%. Comparing base (07bc105) to head (c684ee9).
Report is 1610 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1398   +/-   ##
========================================
  Coverage    87.86%   87.86%           
========================================
  Files           54       54           
  Lines         3089     3089           
  Branches        40       40           
========================================
  Hits          2714     2714           
  Misses         354      354           
  Partials        21       21           

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