feat: add diplomat support

[jfernandes-envoy]

feat: add diplomat v1 and v2 request and response interceptors, response normalization, and split and structured logger infra

Staging E2E Test - Pairing + Invites

Invites: garaje dashboard -> envoy-plugin-ccure -> session-pool-manager -> diplomat-server -> diplomat-client -> ccure instance -> diplomat-client -> diplomat-server -> session-pool-manager -> envoy-plugin-ccure -> diplomat-server -> diplomat-client -> ccure instance -> diplomat-client -> diplomat-server -> envoy-plugin-ccure -> garaje dashboard

0- Initialize Feature Flags to V2 for Deletion

1- Observe Connected V2 Client

2- Delete Connected V2 Client

3- Update Flags to V1 for Setup and Traffic

4- Download:Open V1 Client

5- Update Client Config to Use Diplomat V1

6- Reload Settings and Connect V1 Client

7- Copy Client Secret into Diplomat V1 Config

8- Reopen Client and See it Connected

9- Toggle Enable and Click Save

10- V1 Client Configured

11- V1 Invite Success | Card Number

12.1- V1 Delete Client Operation

12.2- V2 Invite Success | Visitor Info

13- Update Feature Flags to V2 (remove the vals)

14- V2 Go to Integrations Settings

15- Open V2 Client and Pair

16- Close V2 Client, Update Config, Open Client, Connected

17- V2 Invite Success | Card Number

18- V2 Invite Success | Visitor Info

[jfernandes-envoy]

Thanks for the feedback/reviews, @davemun and @JustWalters . I'm gonna close this PR, make a confluence page with these screenshots, and make a new PR linking to that so the PR description is more guarded since this is public. Will tag you both on it, thanks!