feat(config): Add window count and workspace pattern support for dynamic gaps

[xand3r40r93]

Enhance DynamicConfigValue to support window count and workspace pattern matching in per-monitor configurations. This allows for more granular control over gaps based on the number of windows and workspace names.

Key changes:

• Add windows and workspace parameters for PerMonitorValue
• Implement window count aware gap configurations
• Add workspace pattern matching support
• Update documentation with new configuration examples
• Add comprehensive test coverage

default-config.toml

# Gaps between windows (inner-*) and between monitor edges (outer-*).
# Possible values:
# - Constant:     gaps.outer.top = 8
# - Per monitor:  gaps.outer.top = [
#     # Match specific monitor with window count and workspace
#     { monitor.main = { value = 16, windows = 1, workspace = "[123]" } },
#     # Match specific monitor with window count only
#     { monitor.main = { value = 32, windows = 2 } },
#     # Match specific monitor with workspace only
#     { monitor.secondary = { value = 24, workspace = "[^B]" } },
#     # Match specific monitor without conditions
#     { monitor."some-pattern" = 32 },
#     24  # default value when there is no match
# ]
#
# Parameters:
# - value:     The gap size in pixels
# - windows:   (optional) Apply this value only when the monitor has exactly this many windows
# - workspace: (optional) Apply this value only when the workspace name matches this regex pattern
#
# When multiple rules match:
# 1. Rule with matching windows AND workspace has highest priority
# 2. Rule with matching windows only has second priority
# 3. Rule with matching workspace only has third priority
# 4. Rule without conditions has fourth priority
# 5. Default value is used if no rules match
#
# Monitor pattern is the same as for 'workspace-to-monitor-force-assignment'.
# See: https://nikitabobko.github.io/AeroSpace/guide#assign-workspaces-to-monitors