Improve the running time of SandBlaster

[teodutu]

Decrease the time complexity of the build_operation_nodes function by using a dictionary to reduce its complexity from O(len(operation_nodes)^2) to O(len(operation_nodes)).

[razvand]

@CristiMacovei , not sure what you did but the commit you added seems like a merge commit. And it's not properly authored:

commit 4741c74acd02dadd2eb2dc805992e90197e50f34 (HEAD -> optimise-build_operation_nodes, teodutu/optimise-build_operation_nodes)
Merge: 8288b49 d417bf9
Author: CristiMacovei <[email protected]>
Date:   Fri Apr 25 08:48:05 2025 +0300

    Improve `build_operation_nodes` complexity

The goal is to have a single commit as part of the PR, that includes @teodutu 's work together with an update to make it work with the current version of Sandblaster. That commit will be co-authored by you and @teodutu .

For that do the following steps:

1. Create a temporary branch from the teodutu remote:

   git remote add teodutu https://github.com/teodutu/sandblaster
   git fetch teodutu
   git branch tmp teodutu/optimise-build_operation_nodes

2. Create a branch named /optimise-build_operation_nodes from the master branch. We will use it to build the new commit:

   git checkout master
   git checkout -b optimise-build_operation_nodes

3. Cherry-pick @teodutu 's commit:

   git cherry-pick 8288b493336a

4. Make updates to the commit as required, maybe there are conflicts, maybe there are things not working.

5. Add a Signed-off-by: Teodor Dutu <email...> and then a Signed-off-by: Cristian Macovei <email...> message to the commit message.

6. Force push the branch to @teodutu 's remote:

   git push --force teodutu optimise-build_operation_nodes:optimise-build_operation_nodes