feat: add ForCountLoopExpr class

[apkrelling]

Pull Request description

This PR adds the ForCountLoopExpr class. This is an attempt to solve #95 .

How to test these changes

from astx.blocks import Block
from astx.datatypes import Int32, LiteralInt32
from astx.flows import ForCountLoopExpr
from astx.operators import BinaryOp, UnaryOp
from astx.variables import InlineVariableDeclaration, Variable

decl_a = InlineVariableDeclaration("a", type_=Int32, value=LiteralInt32(0))
var_a = Variable("a")
cond = BinaryOp(op_code="<", lhs=var_a, rhs=LiteralInt32(10))
update = UnaryOp(op_code="++", operand=var_a)
body = Block()
body.append(LiteralInt32(2))
for_expr = ForCountLoopExpr(
initializer=decl_a, condition=cond, update=update, body=body)
for_expr

Pull Request checklists

This PR is a:

• bug-fix
• new feature
• maintenance

About this PR:

• it includes tests.
• the tests are executed on CI.
• the tests generate log file(s) (path).
• pre-commit hooks were executed locally.
• this PR requires a project documentation update.

Author's checklist:

• I have reviewed the changes and it contains no misspelling.
• The code is well commented, especially in the parts that contain more
  complexity.
• New and old tests passed locally.

Additional information

Note that there is no transpiler visit method for this class, just like for ForCountLoopStmt.

Reviewer's checklist

Copy and paste this template for your review's note:

## Reviewer's Checklist

- [ ] I managed to reproduce the problem locally from the `main` branch
- [ ] I managed to test the new changes locally
- [ ] I confirm that the issues mentioned were fixed/resolved .

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[xmnlab]

thanks @apkrelling !

[github-actions]

🎉 This PR is included in version 0.16.0 🎉

The release is available on:

• 0.16.0
• GitHub release

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