feat: new blog post "Observing Lambdas" (#5990)

Signed-off-by: Severin Neumann <[email protected]>
Co-authored-by: Tiffany Hrabusa <[email protected]>
Co-authored-by: Patrice Chalin <[email protected]>
Co-authored-by: opentelemetrybot <[email protected]>
Co-authored-by: Severin Neumann <[email protected]>
Co-authored-by: Severin Neumann <[email protected]>

Author: 5 people