style: cosmetic changes

[gbotrel]

• clean: remove unused fuzz test files
• refactor: remove Add Sub Double x86 asm impl
• refactor: remove neg x86 impl
• fix: no carry field generation path
• docs: clean up and cosmetics
• fix: fix previous commit
• docs: cosmetics changes
• style: simplyfing inverse in field element
• style: cosmetics changes in field element
• fix: ensure SetInterface(nil) doesn't panic
• test: added IsUint64 test in field element
• feat: use crypto/rand.Int for field.SetRandom
• fix: remove dead code
• test: use SetRandom instead of rand.read
• style: cosmetics
• build: restore golangci config
• feat: added zero alloc SetRandom and replace hardcoded modulus words with constants
• fix: correct endianess in SetRandom
• style: cosmetics
• style: cosmetics