inital implementation of native provider

[pepoviola]

• Add initial support for native provider.

From command line with -p native flag

node ./dist/cli.js -p native test tests/0006-logs.feature

Or

node ./dist/cli.js -p native spawn tests/0006-logs.toml

NOTE: For native provider network config the image configuration isn't used but you can set the binary to use directly in the default_command / command keys for relay-chain and command for collator.
Both relative and full path are accepted.

E.g:

[settings]
timeout = 1000

[relaychain]
default_image = "{{ZOMBIENET_INTEGRATION_TEST_IMAGE}}"
chain = "rococo-local"
default_command = "../polkadot/target/release/polkadot"

  [[relaychain.nodes]]
  name = "alice"
  extra_args = [ "--alice" ]

  [[relaychain.nodes]]
  name = "bob"
  extra_args = [ "--bob" ]

[[parachains]]
id = 100
addToGenesis = true

  [parachains.collator]
  name = "collator01"
  image = "{{COL_IMAGE}}"
  command = "../polkadot/target/testnet/adder-collator"

Another possibility is to create a symlink to the binaries and make them available in your path so you don't need to change the network config to use between providers.

closes #65