Adding in, hashkey, equal

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Static code analyzer report

Output of the StaticLint.jl code analyzer
Report creation time (UTC): (2024-03-07T11:14:28.297)

• Line 6, column 37: It is preferable to use tin(item,collection) instead of the Julia's in. at offset 266 of raicode/src/linting/extended_checks.jl
• Line 132, column 5: It is preferable to use thaskey(dict,key) instead of the Julia's haskey. at offset 5236 of raicode/src/linting/extended_checks.jl
• Line 187, column 5: It is preferable to use thaskey(dict,key) instead of the Julia's haskey. at offset 7963 of raicode/src/linting/extended_checks.jl
• Line 11, column 5: Macro @spawn should be used instead of @async. at offset 309 of raicode/test/rai_rules_tests.jl
• Line 14, column 11: Threads.nthreads() should not be used in a constant variable. at offset 337 of raicode/test/rai_rules_tests.jl
  🚨In total, 5 errors are found over 2 Julia files🚨