feat(cli): add coder stat command (#8005)

cli/testdata/coder_--help.golden

@@ -34,6 +34,7 @@ Coder v0.0.0-devel — A tool for provisioning self-hosted development environme
                       workspace
     ssh               Start a shell into a workspace
     start             Start a workspace
+    stat              Show resource usage for the current workspace.
     state             Manually manage Terraform state to fix broken workspaces
     stop              Stop a workspace
     templates         Manage templates

cli/testdata/coder_stat_--help.golden

@@ -0,0 +1,19 @@
+Usage: coder stat [flags]
+
+Show resource usage for the current workspace.
+
+Subcommands
+    cpu     Show CPU usage, in cores.
+    disk    Show disk usage, in gigabytes.
+    mem     Show memory usage, in gigabytes.
+
+Options
+  -c, --column string-array (default: host_cpu,host_memory,home_disk,container_cpu,container_memory)
+          Columns to display in table output. Available columns: host cpu, host
+          memory, home disk, container cpu, container memory.
+
+  -o, --output string (default: table)
+          Output format. Available formats: table, json.
+
+---
+Run `coder --help` for a list of global options.

cli/testdata/coder_stat_cpu_--help.golden

@@ -0,0 +1,16 @@
+Usage: coder stat cpu [flags]
+
+Show CPU usage, in cores.
+
+Options
+      --host bool
+          Force host CPU measurement.
+
+  -o, --output string (default: text)
+          Output format. Available formats: text, json.
+
+      --prefix string
+          Unit prefix.
+
+---
+Run `coder --help` for a list of global options.

cli/testdata/coder_stat_disk_--help.golden

@@ -0,0 +1,13 @@
+Usage: coder stat disk [flags]
+
+Show disk usage, in gigabytes.
+
+Options
+  -o, --output string (default: text)
+          Output format. Available formats: text, json.
+
+      --path string (default: /)
+          Path for which to check disk usage.
+
+---
+Run `coder --help` for a list of global options.

cli/testdata/coder_stat_mem_--help.golden

@@ -0,0 +1,13 @@
+Usage: coder stat mem [flags]
+
+Show memory usage, in gigabytes.
+
+Options
+      --host bool
+          Force host memory measurement.
+
+  -o, --output string (default: text)
+          Output format. Available formats: text, json.
+
+---
+Run `coder --help` for a list of global options.