feat: add initial infrastructure setup for pillarbox monitoring

[jboix]

Description

This commit introduces the foundational Infrastructure as Code (IaC) setup for the Pillarbox Monitoring system to automate and simplify the deployment of these services.

• Configures Terraform for managing AWS resources with support for both dev and prod environments.
• Provides Docker Compose for local development and testing.

Checklist

• I have followed the project's style and contribution guidelines.
• I have performed a self-review of my own changes.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.

[defagos]

Cannot really provide a good feedback about the configuration itself (not proficient in this kind of stuff myself), I just reported a few things I noticed.

[MGaetan89]

A first set of comments, I still have some files to check

[jboix]

@MGaetan89 and @defagos I've prepared another PR for the change from qos to monitoring here: SRGSSR/pillarbox-monitoring-transfer#2 Take a look at that so that I can merge this one.

[MGaetan89]

Not a big deal, but just sharing what I saw: TF files have different formats for assignments.

// `=` are aligned
my_block1 {
  my_var            = true
  my_extra_long_var = 42
}

// `=` are not aligned
my_block2 {
  my_var = true
  my_extra_long_var = 42
}