Update the body type in the log

[GanymedeNil]

Description

According to the definition of the Body field type in the OTel 1.22.0 Logs Data Model article, the Body field should be of type 'any' and should not use the str method to directly translate the msg. This is because str only converts non-text types into a human-readable form, rather than a standard format, which leads to the need for additional operations when collected through a log collector.

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: GanymedeNil / name: GanymedeNil (a49fed8, b4f44a2, 4595953, eef7ea1, f72d854)
• ✅ login: shalevr / name: Shalev Roda (f296239, 03ef5dc)
• ✅ login: srikanthccv / name: Srikanth Chekuri (a9272e6)
• ✅ login: ocelotl / name: Diego Hurtado (c09192c, c5ec6b9, 58d5d8e)

[shalevr]

Can you please add a test to be clear about which cases you want to correct

[GanymedeNil]

Can you please add a test to be clear about which cases you want to correct

All right, I will include test cases.