refactor: improve delivery timing

[Freyskeyd]

Description

This PR refactors a bit the workflow that trigger new certs for delivery.
It also adds new queries on GraphQL in order to extract context from nodes.

Previous refactorization introduced pull mechanism on the broadcast where the task manager where actively pulling the next certificate from the pending_pool, the setup was to allow the broadcast to start consuming the pending_pool when ready. However, a corner case exists that this PR is solving:

• pending_pool checking tick is 10sec (1sec in reality) and tick at S0
• certificate A arrives on the node, is valid and can be delivered at S2
• ...
• pending_pool checking tick execute at S10
• certificate A is being broadcast

Between S2 and S10 the certificate is waiting in the pending_pool for nothing.

The changes are modifying this and do:

• pending_pool checking tick is 10sec (1sec in reality) and tick at S0
• certificate A arrives on the node, is valid and can be delivered at S2
• A broadcast command is sent to the task manager at S2, the task manager check the precedence of the certificate and see that the parent is delivered
• certificate A is being broadcast
• ...
• pending_pool checking tick execute at S10

Next / Questions / Options

• The pending_pool tick could be set to a lower value or even switched to a proper channel between the pending_pool and the task_manager

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[codecov]

Codecov Report

Attention: Patch coverage is 78.21782% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 71.95%. Comparing base (d2ec941) to head (faf394d).

Files	Patch %	Lines
crates/topos-tce-storage/src/validator/mod.rs	58.82%	14 Missing ⚠️
crates/topos-tce/src/app_context/api.rs	47.82%	12 Missing ⚠️
crates/topos-tce-api/src/graphql/query.rs	91.13%	7 Missing ⚠️
crates/topos-tce/src/app_context/network.rs	63.15%	7 Missing ⚠️
crates/topos-tce-broadcast/src/task_manager/mod.rs	57.14%	3 Missing ⚠️
crates/topos-tce-storage/src/client.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #466      +/-   ##
==========================================
+ Coverage   71.60%   71.95%   +0.35%     
==========================================
  Files         225      225              
  Lines       12504    12659     +155     
==========================================
+ Hits         8953     9109     +156     
+ Misses       3551     3550       -1     

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[dvdplm]

I need a better PR description to give me the context for these changes. I'm too slow to review this otherwise.

[dvdplm]

Overall LGTM, but I have a bunch of questions.