165 transaction content max size

[blackode]

Description

In this change, we are keeping the threshold limit for the size of the content in the data field of the transaction. This means we are not allowing the content size to be greater than the configured threshold limit.

Add validation functions for the changesest TransactionPayload and TransactionData structs.

A new config line was added as follows

config :archethic, :transaction_data_content_max_size, 3_145_728

Fixes #165

Type of change

• New feature (setting up the max-content size )

How Has This Been Tested?

Creating the content size greater than content_max_size using the LOC

Base.encode16(:crypto.strong_rand_bytes(4 * 1024 * 1024))

and trying to create a changeset of the transaction payload.

• Test API should return an error if the content size is greater than the content_max_size
• Test Mining should return an error if the content size is greater than the content_max_size

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on 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