[COMPILER/FEATURE] Support rt_packed

__ARMCC_VERSION:         https://smtp.keil.com/support/man/docs/armcc/armcc_chr1359124980173.htm
__IAR_SYSTEMS_ICC__:     <Not Found>
__GNUC__:                https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-packed-type-attribute
__ADSPBLACKFIN__:        <Not Found>
_MSC_VER:                https://learn.microsoft.com/en-us/cpp/preprocessor/pack?view=msvc-170
__TI_COMPILER_VERSION__: https://software-dl.ti.com/codegen/docs/tiarmclang/rel1_3_0_LTS/migration_guide/migrating_c_and_cpp_source/pragmas_and_attributes.html
__TASKING__:             https://resources.tasking.com/sites/default/files/2021-02/TASKING_Alignment%20Requirements%20Restrictions_WEB.pdf

Usage:
```c
rt_packed(struct object1
{
    int dword;
    char byte;
});
typedef struct object1 object1;

rt_packed(struct object2
{
    int dword;
    char byte;
});
```

Signed-off-by: GuEe-GUI <[email protected]>

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