Refactor implementation to comply with MISRA rules.

[dmitrykos]

• Rename IKernel::EState to IKernel::EKernelState and its members from STATE_ to KSTATE_ to resolve ambiguity with task state.
• Make EnumerateTasks, EnumerateKernelTasks safe by using stk::ArrayView wrapper for arrays.

[github-actions]

MemBrowse Memory Report

stm32f0-sleep

• FLASH: .text +188 B (+1.0%, 19,800 B / 65,536 B, total: 30% used)

stm32f1-sleep

• FLASH: .text +196 B (+1.0%, 18,921 B / 131,072 B, total: 14% used)

stm32f4-sleep

• FLASH: .text +196 B (+1.0%, 19,749 B / 1,048,576 B, total: 2% used)

[github-actions]

LCOV of commit c2a324f during Code Coverage - Generic #562

Summary coverage rate:
  lines......: 99.8% (1289 of 1291 lines)
  functions..: 44.4% (1617 of 3641 functions)
  branches...: no data found

Files changed coverage rate: n/a

⛔ The code coverage is too low: 99.85. Expected at least 100.

[github-actions]

LCOV of commit db8f5d3 during Code Coverage - Generic #563

Summary coverage rate:
  lines......: 100.0% (1289 of 1289 lines)
  functions..: 44.4% (1617 of 3641 functions)
  branches...: no data found

Files changed coverage rate: n/a