Move Ethereum specific RLP encoding tests under tests/common (#673)

This is more according to the structure of the code itself.
And also, currently some of these tests live under tests/rlp but
some under tests/common. Could use some further re-organisation
within the different tests, but this move is a first step.

tests/common/all_tests.nim

@@ -1,5 +1,5 @@
-# Nimbus
-# Copyright (c) 2023 Status Research & Development GmbH
+# nim-eth
+# Copyright (c) 2023-2024 Status Research & Development GmbH
 # Licensed under either of
 #  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
 #    http://www.apache.org/licenses/LICENSE-2.0)
@@ -10,5 +10,6 @@
 
 import
   test_eth_types,
+  test_eth_types_rlp,
+  test_common,
   test_eip4844
-  

tests/common/test_common.nim

@@ -17,7 +17,7 @@ type
     header: BlockHeader
 
 proc loadFile(x: int) =
-  let fileName = "tests" / "rlp" / "eip2718" / "acl_block_" & $x & ".json"
+  let fileName = "tests" / "common" / "eip2718" / "acl_block_" & $x & ".json"
   test fileName:
     let n = json.parseFile(fileName)
     let data = n["rlp"].getStr()

tests/common/test_eth_types_rlp.nim

@@ -1,3 +1,13 @@
+# nim-eth
+# Copyright (c) 2023-2024 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 {.used.}
 
 import
@@ -28,7 +38,7 @@ proc runTest(importFile: string): bool =
   importBlock(res.get)
 
 suite "Decode multiple EthBlock from bytes":
-  for filename in walkDirRec("tests/rlp/rlps"):
+  for filename in walkDirRec("tests/common/rlps"):
     if not filename.endsWith(".rlp"):
       continue
     test filename:

tests/rlp/all_tests.nim

@@ -1,6 +1,4 @@
 import
   ./test_api_usage,
-  ./test_common,
   ./test_json_suite,
-  ./test_object_serialization,
-  ./test_rlp_codec
+  ./test_object_serialization