Implement UDC balance_per_node and max_funding yaml options.

[deepbrook]

Implements feature as requested per #218 :

2 new keys are available in the udc section of the yaml file:

settings:
  services:
    udc:
      enable: true
      token:
        deposit: true
        # The number of RDN/UDC Tokens required by each node
        balance_per_node: 5000
        # The maximum funding amount to deposit - defaults to `balance_per_node` if not given.
        max_funding: 5000

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (dev@3ddbdc4). Click here to learn what that means.
The diff coverage is 90.47%.

@@          Coverage Diff           @@
##             dev     #221   +/-   ##
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  Coverage       ?   51.84%           
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  Files          ?       62           
  Lines          ?     3061           
  Branches       ?        0           
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  Hits           ?     1587           
  Misses         ?     1474           
  Partials       ?        0

Impacted Files	Coverage Δ
scenario_player/runner.py	28.43% <0%> (ø)
scenario_player/utils/configuration/settings.py	93.33% <100%> (ø)
scenario_player/utils/token.py	92.48% <87.5%> (ø)

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[czepluch]

Looks good to me. If my comment is too nitpicky please merge without fixing.

[christianbrb]

@nlsdfnbch Is this backward compatible -> does the old functionality still works or do we need to adjust the scenarios?

At the moment nodes seem to get 1000 Test-RDN Rai tokens at the start of a scenario when udc is enabled.