Pass rpc/server RPC results and examples to RPCHelpMan
Pass rpc/server RPC results and examples to RPCHelpMan

Summary:
Partial backport of Core [[https://github.com/bitcoin/bitcoin/pull/14987 | PR14987]]

Depends on D5809

Test Plan:
On master:
  ninja
  ./bitcoind
  ./bitcoin-cli help > RPCs
  ./getrpchelps.sh RPCs master
Then on the patched branch:
  ninja
  ./bitcoind
  ./getrpchelps.sh RPCs abcPatched
  ./checkrpc.sh RPCs master abcPatched abc.diff
Verify the changes in `abc.diff`.

Scripts:
{F4258185}
{F4258184}

server.diff:
{F4258364}

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5815

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