feat(katana): prevent sequencer to treat all block from start

[ybensacq]

Description

1. add new fields in config file send_from_block & config_file
2. rename from_block to gather_from_block
3. update send_from_block poll_next method
4. use new send_from_block to start to send transactions

Related issue

Tests

• Yes
• No, because they aren't needed
• No, because I need help

Added to documentation?

• README.md
• Dojo Book
• No documentation needed

Checklist

• I've formatted my code (scripts/prettier.sh, scripts/rust_fmt.sh, scripts/cairo_fmt.sh)
• I've linted my code (scripts/clippy.sh, scripts/docs.sh)
• I've commented my code
• I've requested a review after addressing the comments