[ZAP] Ordering of EmberAfAttributeMetadata can save 4 bytes padding per attribute

[tima-q]

Reproduction steps / Feature

1. Build any example app
2. Re-order EmberAfAttributeMetadata in src/app/util/attribute-metadata.h
3. Build again
4. Witness gain of 4 bytes per attribute defined in endpoint_config.h
   -- done for qpg - ARM GCC compiler

Re-ordering to avoid padding in a typical best-effort way - largest members first, fitting into native boundaries - 32-bit in this case.
As this can be different on other native typed platforms, the current situation was always bloated:
Ordering of 1 bytes - 2 byte - 1 byte introduces padding for virtually any platform.

As the content is generated from ZAP out, a header update is not enough.
The template in src/app/zap-templates/templates/app/endpoint_config.zapt takes the content straight from a variable, not populated in the connectedhomeip repo - presumeably from ZAP ?

#define GENERATED_ATTRIBUTES {{ endpoint_attribute_list }}

Re-ordering:
Current:

struct EmberAfAttributeMetadata
{
    /**
     * Attribute ID, according to ZCL specs.
     */
    chip::AttributeId attributeId;
    /**
     * Attribute type, according to ZCL specs.
     */
    EmberAfAttributeType attributeType;
    /**
     * Size of this attribute in bytes.
     */
    uint16_t size;
    /**
     * Attribute mask, tagging attribute with specific
     * functionality.
     */
    EmberAfAttributeMask mask;
    /**
     * Pointer to the default value union. Actual value stored
     * depends on the mask.
     */
    EmberAfDefaultOrMinMaxAttributeValue defaultValue;

Re-ordered:
struct EmberAfAttributeMetadata_II
{
    /**
     * Pointer to the default value union. Actual value stored
     * depends on the mask.
     */
    EmberAfDefaultOrMinMaxAttributeValue defaultValue;

    /**
     * Attribute ID, according to ZCL specs.
     */
    chip::AttributeId attributeId;
    
    /**
     * Size of this attribute in bytes.
     */
    uint16_t size;

    /**
     * Attribute type, according to ZCL specs.
     */
    EmberAfAttributeType attributeType;

    /**
     * Attribute mask, tagging attribute with specific
     * functionality.
     */
    EmberAfAttributeMask mask;

Platform

other

Platform Version(s)

all

Type

Manually tested with SDK

(Optional) If manually tested please explain why this is only manually tested

Build time checked

Anything else?

No response