Evaluate update to Nim 2.x

[gmega]

With gc:refc at first.

[2-towns]

I will create subtasks to ensure clear tracking of comments, as I believe we will have many comments.

[2-towns]

I updated constantine dependency to the last commit hash because there is a compilation error with Nim 2.X.

Additionally, I updated the PR created by Ben for GCC 14 on nim-poseidon2 to reflect this change.

[2-towns]

There is a problem with the default SAT resolver of nimble; it fails when trying to install dependencies; see vacp2p/nim-libp2p#1219.

I will use nimble --solver:legacy install until it is fixed.

[2-towns]

With gc:refc at first.

It became mm:refc (https://nim-lang.org/docs/mm.html).

[2-towns]

Contributions to sub-dependencies:

• nim-poseidon2: https://github.com/codex-storage/nim-poseidon2/tree/bump-constantine-gcc14 (resume Ben's work)
• nim-datatore: https://github.com/codex-storage/nim-datastore/tree/update-to-nim-2-x
• nim-codex-dht: https://github.com/codex-storage/nim-codex-dht/tree/update-to-nim-2-x
• nim-eth-versioned: https://github.com/codex-storage/nim-eth-versioned/tree/update-to-nim-2-x
• nim-ethers: https://github.com/codex-storage/nim-ethers/tree/update-to-nim-2-x
• nim-contract-abi: Update for Nim 2.0.x nim-contract-abi#9
• nim-nitro: https://github.com/codex-storage/nim-nitro/tree/update-to-nim-2-x

Found issue in nim-results:

arnetheduck/nim-results#50

Contribute to nim-testutils to fix case:

status-im/nim-testutils#54

[2-towns]

I disabled for now the thread analysis using --threadAnalysis:off