Max cap search results for ots API by default + cli flag to override it

[wmitsuda]

Otterscan API search methods allow the user to inform the page size.

This PR adds an internal max (default == 25 results) to cap the page size, regardless of what the user asks.

It also adds a --ots.search.max.pagesize CLI args to override this max (either in erigon and rpcdaemon binaries).

[wmitsuda]

Example JSON-RPC response for ots_searchTransactionsBefore method if user asks a pagesize > than allowed:

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32000,
    "message": "max allowed page size: 100"
  }
}

[AskAlexSharov]

I like it. We need same for grpc pagination.

[wmitsuda]

fixed the broken tests :)

I think it's now good to be merged, pls @AskAlexSharov