Add cpu temperature graph and fix multi-core display issue

[Klipar]

New Feature:

• Display CPU cores temperature as an alternative to the CPU load graph.

• Users can toggle between CPU load and CPU temperature using:

  • 's' - (sensors),
  • 't'- (temperature)

• The maximum value of the graph is automatically adjusted:

  • CPU load: 100%
  • CPU temperature: 120°C

Bug Fix:

• Fixed an issue where the display of CPU cores would break when there were more than 9 cores.
• The spacing between CPU number and its value is now calculated dynamically to handle any number of cores.

Implementation details:

• Created separate data arrays for CPU load (cpuLoadData) and CPU temperature (cpuTemperatureData).
• Added helper methods _createCpuSeries and _updateSeriesData to manage series creation and history updates.