docs: add Rafael Belchior as a maintainer

1. The MAINTAINERS.md file was updated with contact details
2. The CODEOWNERS file was updated so that in addition to the current
code owners Rafael also has ownership of some of the sub-direcotires where
he is the most active in terms of contributions.
3. We welcome Rafael to expand the scope of ownership on packages later
as we are always looking to get more help with maintaining the code. :-)

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

CODEOWNERS

@@ -1,2 +1,7 @@
 * @petermetz @takeutak @izuru0 @jagpreetsinghsasan @vramakrishna @sandeepnRES @outSH
 
+packages/cactus-plugin-satp-hermes @RafaelAPB
+packages/cactus-plugin-ledger-connector-ubiquity @RafaelAPB
+examples/cactus-example-cbdc-bridging @RafaelAPB
+examples/cactus-example-cbdc-bridging-backend @RafaelAPB
+examples/cactus-example-cbdc-bridging-frontend @RafaelAPB

MAINTAINERS.md

@@ -12,6 +12,7 @@ Maintainers
 | Jagpreet Singh Sasan | [jagpreetsinghsasan][jagpreetsinghsasan] | jagpreetsinghsasan |
 | Venkatraman Ramakrishna | [VRamakrishna][VRamakrishna] | vramaiitkgp |
 | Sandeep Nishad | [sandeepnRES][sandeepnRES] | sandeepn |
+| Rafael Belchior | [RafaelAPB][RafaelAPB] | rafaelapb |
 
 [izuru0]: https://github.com/izuru0
 [outSH]: https://github.com/outSH
@@ -20,6 +21,7 @@ Maintainers
 [jagpreetsinghsasan]: https://github.com/jagpreetsinghsasan
 [VRamakrishna]: https://github.com/VRamakrishna
 [sandeepnRES]: https://github.com/sandeepnRES
+[RafaelAPB]: https://github.com/RafaelAPB
 
 **Emeritus Maintainers**