feat: sessions for namespaces

[Ramilito]

Description

• Add namespace to the cached file to enable namespace and context based session
• Simplify the handling of configuration files by using kube-rs for types and kubeconfig object handling
• Use all files under .kube folder and merge them
• Keep track of what context is used in what file to update the correct one

Fixes #35

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Manually and with the tests available

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules