INIT: add `GetIgniteInfo` gRPC API for apps

[Pantani]

Description

Introduce a GetIgniteInfo gRPC API endpoint to allow applications to query information about the running Ignite instance. This would enable apps to check the Ignite version (and other metadata), improving compatibility across different versions.

Motivation

Currently, there’s no standardized way for an app to determine which version of Ignite is executing it. This can lead to compatibility issues, especially when:

• A new version of Ignite introduces a command that conflicts with an existing app command.
• An app is built assuming specific behavior or features available only in certain Ignite versions.

By exposing version and capability information via a GetIgniteInfo API, apps can dynamically adapt or fail gracefully when incompatible versions are detected.

Use Case Example

• App A is created with a custom command on Ignite v1.2.
• Ignite v1.3 introduces a native command with the same name, causing a conflict.
• Using GetIgniteInfo, App A can detect the version and warn the user or change behavior accordingly.

Proposed Response Structure

message IgniteInfo {
  string ignite_version = 1;
  string build_date = 2;
  string source_hash = 3;
  string config_version = 4;
  string cosmos_sdk_version = 5;
  string buf_build_version = 6;
  string ignite_home_path = 7;
}