This commit changes how the context is created and inherited to better
reflex the relationship of the components. We now have the following
context structure,
```
For ephemeral nodes, the context chain is,
main HarnessTest -> sub HarnessTest -> HarnessNode -> HarnessRPC
For standby nodes, the context chain is,
main HarnessTest -> standby HarnessNode -> HarnessRPC
```
This commit replaces the keys used in the maps `activeNodes` and
`standbyNodes` from `pubkeyStr` to `NodeID` such that even the node is
not properly started, we can still clean it up during shutdown.
This commit adds a new component, `HarnessTest`, as a test manager, which
is responsible for managing the state change in the itest. It is built
on top of `HarnessNode` and will be handling assertions so that a test
can be created without unnecessary attention to node's unwanted
failures. This commit also adds a minimal set of assertions.
This commit adds a new struct, `nodeManager`, to manage running nodes.
It keeps track of the running nodes, and manages the start and stop of
the nodes with the context of `HarnessTest`.
This commit adds several helper functions and a fee service. Note that
the fee service is identical to what's inside `lntest`. Once the
migration is done, the old file will be removed.
This commit adds a new struct, `HarnessNode`, to manage the lnd process
used in our itest. This struct is built upon `HarnessRPC`, `State`, and
`NodeWatcher`.
This commit adds a new struct, `nodeWatcher`, to keep track of all graph
topology updates of a given node, including updates from channel edges,
policies, and peers.
This commit adds a new package `lntemp/node` and inside it a new struct
`State` is added to track the internal node state. This enables us using
the same running nodes accross tests without wrong uncleaned states.
This commit starts the construction of the new package `lntemp`. This
package serves as the scaffolding while we migrate our old itest into
the new one. Once the migration is finished, the package will be put
back to `lntest`.
