Explorer optimizations (read DB before asking network when possible)

[bchamagne]

Description

Fetch explorer's data from DB if it is available on current node. This avoid plenty of network requests.
ALSO: Refactored a bit the pagination to be consistent across all pages

Fixes #730

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Tested the explorer

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

[bchamagne]

As discussed with @Neylix , the same optimisation can be used on many functions from the Archethic module.
Plus, I should not run an election to determine if the node has the local data, because elections change over time (they are based on the currently available nodes).