feat: Implement build state tracking and interactive package specification creation

- Added StateTracker to manage build steps and allow resuming interrupted builds.
- Updated post_extract function to utilize StateTracker for patch and command execution.
- Introduced makefile.rs to handle building and installing packages via Makefile.
- Created interactive.rs for an interactive package specification creator with SHA256 computation for source URLs.
- Enhanced checksum verification to support multiple algorithms (SHA256, SHA512, MD5).
- Added example configuration files in contrib for system-wide and user-level Depot configurations.
- Updated tests to cover new functionality and ensure correctness of state tracking and interactive creation.

contrib/README.md

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+Contrib: example system and user configuration files for Depot
+
+Place these files on your system to provide sensible defaults and examples
+for `/etc/depot.toml`, `/etc/depot.d/build.toml`, or user-level configs.
+
+Recommended installation:
+
+  # System-wide
+  sudo cp contrib/depot.toml /etc/depot.toml
+  sudo mkdir -p /etc/depot.d
+  sudo cp -r contrib/depot.d/* /etc/depot.d/
+
+  # Per-user (example)
+  mkdir -p ~/.config
+  cp contrib/user.depot.toml.example ~/.config/depot.toml
+
+Notes
+ - These files are examples only. Review and adapt to your distribution and
+   security policies before deploying.
+ - The config loader supports append syntax (e.g. `cflags += ["-g"]`).

contrib/depot.d/build.toml

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+[flags]
+# Default build flags applied to all packages via /etc/depot.d/build.toml
+# Compiler selection
+cc = "gcc"
+
+# Default CFLAGS
+cflags = ["-O2"]
+cflags += ["-pipe"]
+
+# Default LDFLAGS
+ldflags = ["-Wl,-O1"]
+
+# CARCH short name (can be overridden per-package)
+carch = "x86_64"
+
+# Example of appending per-package cflags: (will be exposed as build.cflags appends)
+# cflags += ["-march=native"]

contrib/depot.d/package.toml

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+[package]
+# System-wide package overrides. Example: set default provides or package metadata
+# name = ""
+
+# Example: provide a virtual runtime package name to satisfy runtime deps
+# provides = ["filesystem"]

contrib/depot.toml

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+# Example /etc/depot.toml - system-wide configuration for Depot
+
+[build]
+# Installation prefix for package builds
+prefix = "/usr"
+# Default compiler and archiver
+cc = "gcc"
+ar = "ar"
+
+[build.flags]
+# Basic compiler flags
+cflags = ["-O2"]
+# Append additional flags (demonstrates += append support)
+cflags += ["-g"]
+
+# Linker flags
+ldflags = ["-Wl,-O1"]
+
+# Target architecture short name (CARCH). Defaults to host arch if unset.
+carch = "x86_64"
+
+# Target triples (optional)
+#chost = "x86_64-pc-linux-gnu"
+#cbuild = "x86_64-pc-linux-gnu"

contrib/user.depot.toml.example

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+# Example per-user configuration (~/.config/depot.toml)
+
+[build]
+prefix = "/usr/local"
+cc = "clang"
+
+[build.flags]
+cflags = ["-O2"]
+cflags += ["-g"]
+carch = "x86_64"