feat: build: Add SupraSeal-PC2 binary script

[rjan90]

Proposed Changes

Add the SupraSeal-PC2 script made by @vmx 🙏 to the /scripts folder in Lotus, to make building the SupraSeal-PC2 binary easier and without needing SPDK checkout.

Testing

Running the script on a machine with the proper pre-requisites (which will be in the Lotus documentation)

cd scripts/
./supraseal-pc2.sh
Cloning into 'supra_seal'...
remote: Enumerating objects: 772, done.
remote: Counting objects: 100% (299/299), done.
remote: Compressing objects: 100% (139/139), done.
----
+ cc -O2 -fno-builtin -fPIC -Wall -Wextra -Werror -march=native -D__ADX__ -mno-avx -c ./src/server.c
+ cc -O2 -fno-builtin -fPIC -Wall -Wextra -Werror -march=native -D__ADX__ -mno-avx -c ./build/assembly.S
+ ar rc libblst.a assembly.o server.o

Which will give you the supra_seal folder with the pc2-binary ready for 32GiB and 512MiB-sectors

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, market, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• If the PR affects users (e.g., new feature, bug fix, system requirements change), update the CHANGELOG.md and add details to the UNRELEASED section.
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green