Feat: Add Term, IsStatic, and StaticValue fields to SpQueryField

[CarolineDenis]

Fixes #7748

Warning

This PR affects database migrations. See migration testing instructions.

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone
• Add pr to documentation list
• Add automated tests
• Add a reverse migration if a migration is present in the PR
• Add migration function to

  specify7/specifyweb/specify/management/commands/run_key_migration_functions.py

  Line 50 in ea04665

  def fix_schema_config(stdout: WriteToStdOut | None = None):

Testing instructions

• Check that the spqueryfield table has three new columns:
  Term → VARCHAR(255), nullable
  IsStatic → BOOLEAN, nullable, default FALSE
  StaticValue → TEXT, nullable
• Confirm that existing rows are unaffected (Term = NULL, IsStatic = NULL or FALSE, StaticValue = NULL).