refactor(mqtt): enhance property process

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Fixes:

https://github.com/cnrancher/octopus/issues/156

Problem:

There are some issues in MQTT adaptor implement:

1. Enrich the type of property.
2. The existing access model cannot handle those write-only registers, and some registers only need to be read once.
3. Support arithmetic operations in collected value.
4. The existing logic only consider the "string" message, we should support the pure "bytes" message.

Solution:

1. Adjusted type, the following type table shows the detail.

   Name	Type	Bits
   int8	(basic) integer	8
   int16	(basic) integer	16
   int, int32	(basic) integer	32
   int64	(basic) integer	64
   uint8	(basic) integer	8
   uint16	(basic) unsigned integer	16
   uint, uint32	(basic) unsigned integer	32
   uint64	(basic) unsigned integer	64
   float, float32	(basic) float	32
   double, float64	(basic) float	64
   boolean	(basic) bool	1
   string	(basic) string	*
   hexString	(bytes) hex in string, like CD01	*
   binaryString	(bytes) binary in string, like 00000001	*
   base64String	(bytes) base64-encoded in string	*

2. Introduced contentType and endianness.

   ContentType	Type	Meaning
   bytes	string	the content is the raw bytes
   text	string	the content is in string text bytes

   Specify contentType to indicate the type of value, the default value is bytes.

   Endian	Type	Meaning
   BigEndian	string	byte order in big-endian
   BigEndianSwap	string	byte order in swapping big-endian
   LittleEndian	string	byte order in little-endian
   LittleEndianSwap	string	byte order in swapping little-endian

   When contentType is bytes, specify endianness to indicate the byte order of (basic) type value, the default value is BigEndian.

3. Introduced accessModes to specify multiple access modes of a property, the default value is Notify, the following table shows the changed.

   Name	Meaning
   ReadOnce	the property is only read once.
   WriteOnce	the property is only written once.
   WriteMany	the property will be written at the synchronization moment.
   Notify	the change of property will be subscribed.

4. Introduced arithmeticOperations to do arithmetic operations.

5. Related PR: https://github.com/cnrancher/octopus-simulator/pull/7

Change Diffs:

spec:
  adaptor:
    node: edge-worker
    name: adaptors.edge.cattle.io/mqtt
  model:
    apiVersion: "devices.edge.cattle.io/v1alpha1"
    kind: "MQTTDevice"
  template:
    spec:
      protocol:
+       syncInterval: 10s
      properties:
        - name: gear
-         path: "action.gear"
-         operator:
-           write: set
-           read: status
          type: int
-          readOnly: false
+         accessModes: 
+           - Write
+           - Notify
+         visitor:
+           path: "action.gear"
+           operator: 
+             write: set
+             read: status
+           contentType: text
+           endianness: BigEndian
+           arithmeticOperations:
+             - type: Multiply
+               value: "0.03125"

Test plan:

None

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@guangbochen , please label this PR with pinned. thanks~