chore(sequencer_infra): rename sequencer infra package

[Itay-Tsabary-Starkware]

Stack:

• chore(sequencer_infra): move server loop function #1516
• chore(sequencer_node): rename sequencer node package #1513
• chore(sequencer_infra): rename sequencer infra package #1512 ⬅

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

[reviewable-StarkWare]

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.79%. Comparing base (b0cfe82) to head (b1f296a).
Report is 468 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1512      +/-   ##
==========================================
+ Coverage   74.18%   75.79%   +1.60%     
==========================================
  Files         359      361       +2     
  Lines       36240    38437    +2197     
  Branches    36240    38437    +2197     
==========================================
+ Hits        26886    29132    +2246     
+ Misses       7220     7096     -124     
- Partials     2134     2209      +75     

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