Add UEFI Common Platform Error Record (CPER) support

CPER is the format used to describe platform hardware error by various
tables, such as ERST, BERT and HEST etc.

The event severity message is printed here:
https://github.com/torvalds/linux/blob/v6.7/drivers/firmware/efi/cper.c#L639

Examples are as below.

Corrected error:
kernel: {37}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 162
kernel: {37}[Hardware Error]: It has been corrected by h/w and requires no further action
kernel: {37}[Hardware Error]: event severity: corrected
kernel: {37}[Hardware Error]:  Error 0, type: corrected
kernel: {37}[Hardware Error]:   section_type: memory error
kernel: {37}[Hardware Error]:   error_status: 0x0000000000000400
kernel: {37}[Hardware Error]:   physical_address: 0x000000b50c68ce80
kernel: {37}[Hardware Error]:   node: 1 card: 4 module: 0 rank: 0 bank: 1 device: 14 row: 58165 column: 816
kernel: {37}[Hardware Error]:   error_type: 2, single-bit ECC
kernel: {37}[Hardware Error]:   DIMM location: CPU 2 DIMM 30

Recoverable error:
kernel: {3}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 4
kernel: {3}[Hardware Error]: event severity: recoverable
kernel: {3}[Hardware Error]:  Error 0, type: recoverable
kernel: {3}[Hardware Error]:  fru_text: B1
kernel: {3}[Hardware Error]:   section_type: memory error
kernel: {3}[Hardware Error]:   error_status: 0x0000000000000400
kernel: {3}[Hardware Error]:   physical_address: 0x000000393cfe5040
kernel: {3}[Hardware Error]:   node: 2 card: 0 module: 0 rank: 0 bank: 3 device: 0 row: 34719 column: 320
kernel: {3}[Hardware Error]:   DIMM location: not present. DMI handle: 0x0000

Fatal error:
kernel: BERT: Error records from previous boot:
kernel: [Hardware Error]: event severity: fatal
kernel: [Hardware Error]:  Error 0, type: fatal
kernel: [Hardware Error]:  fru_text: DIMM B5
kernel: [Hardware Error]:   section_type: memory error
kernel: [Hardware Error]:   error_status: 0x0000000000000400
kernel: [Hardware Error]:   physical_address: 0x000000393d7e4040
kernel: [Hardware Error]:   node: 2 card: 4 module: 0 rank: 0 bank: 3 device: 0 row: 34743 column: 256

Steps to test the new metrics.

$ echo "kernel: {37}[Hardware Error]: event severity: corrected" | sudo tee /dev/kmsg
$ echo "kernel: {3}[Hardware Error]: event severity: recoverable" | sudo tee /dev/kmsg
$ echo "kernel: [Hardware Error]: event severity: fatal" | sudo tee /dev/kmsg

Expected metrics are as below:
$ curl localhost:20257/metrics
problem_counter{reason="CperHardwareErrorCorrected"} 1
problem_counter{reason="CperHardwareErrorFatal"} 1
problem_counter{reason="CperHardwareErrorRecoverable"} 1
...
problem_gauge{reason="CperHardwareErrorFatal",type="CperHardwareErrorFatal"} 1

Signed-off-by: Jian Wen <wenjianhn@gmail.com>

Author: wenjianhn

config/kernel-monitor.json

@@ -15,6 +15,11 @@
 			"type": "XfsShutdown",
 			"reason": "XfsHasNotShutDown",
 			"message": "XFS has not shutdown"
+		},
+		{
+			"type": "CperHardwareErrorFatal",
+			"reason": "CperHardwareHasNoFatalError",
+			"message": "UEFI CPER has no fatal error"
 		}
 	],
 	"rules": [
@@ -69,6 +74,22 @@
 			"reason": "MemoryReadError",
 			"pattern": "CE memory read error .*"
 		},
+		{
+			"type": "temporary",
+			"reason": "CperHardwareErrorCorrected",
+			"pattern": ".*\\[Hardware Error\\]: event severity: corrected$"
+		},
+		{
+			"type": "temporary",
+			"reason": "CperHardwareErrorRecoverable",
+			"pattern": ".*\\[Hardware Error\\]: event severity: recoverable$"
+		},
+		{
+			"type": "permanent",
+			"condition": "CperHardwareErrorFatal",
+			"reason": "CperHardwareErrorFatal",
+			"pattern": ".*\\[Hardware Error\\]: event severity: fatal$"
+		},
 		{
 			"type": "permanent",
 			"condition": "KernelDeadlock",