feat: send token sequencer test

[atanmarko]

Description

Implemented sequencer test with send tocken and certificate cration

Fixes TP-594

Additions and Changes

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

Merging #234 (0975f0b) into main (789b803) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
- Coverage   59.45%   59.44%   -0.01%     
==========================================
  Files         170      170              
  Lines        9643     9644       +1     
==========================================
  Hits         5733     5733              
- Misses       3910     3911       +1     

Impacted Files	Coverage Δ
crates/topos-sequencer-subnet-client/src/lib.rs	0.40% <0.00%> (ø)
...pos-sequencer-subnet-client/src/subnet_contract.rs	0.00% <0.00%> (ø)

[gruberb]

Nothing too major, just suggesting adding conts and variables instead of directly adding &str.

[gruberb]

LGTM 👍