Implement ocre-timers and ocre-messaging on Linux platform

[kr-t]

Description

• Implement ocre-timers and ocre-messaging on Linux platform
• Port ocre-common to Linux
• Add necessary wrappers for new platform-specific units
• Port ocre-timers to Linux
• Port ocre-messaging to Linux

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Ocre-Runtime on Linux and Zephyr with blinky and messaging samples from ocre-sdk.
Linux X86_64 logs for messaging app, which uses both messaging and timers:
./build.sh -t l -r -f /home/krisztian/demos/ocre-sdk/generic/messaging/subscriber/build/subscriber.wasm /home/krisztian/demos/ocre-sdk/generic/messaging/publisher/build/publisher.wasm

[DEBUG] Published message: ID=0, topic=test/topic, content_type=text/plain, payload_len=15
Published: Test message 0 to topic test/topic
[DEBUG] Retrieved Messaging event: message_id=0, topic=test/topic, topic_offset=131080, content_type=text/plain, content_type_offset=131096, payload_len=15, owner=0x56311b0c9a28
Received message: topic=test/topic, content_type=text/plain, payload=Test message 0, len=15
[DEBUG] Timer callback for timer 1
[DEBUG] Creating timer event: type=0, id=1, for owner 0x56311b0e2a90
[DEBUG] Queued timer event for timer 1
[DEBUG] Retrieved Timer event timer_id=1, owner=0x56311b0e2a90
[DEBUG] Creating messaging event: ID=1, topic=test/topic, content_type=text/plain, payload_len=15 for module 0x56311b0c9a28
[DEBUG] Queued messaging event for message ID 1
[DEBUG] Published message: ID=1, topic=test/topic, content_type=text/plain, payload_len=15
Published: Test message 1 to topic test/topic
[DEBUG] Retrieved Messaging event: message_id=1, topic=test/topic, topic_offset=131080, content_type=text/plain, content_type_offset=131096, payload_len=15, owner=0x56311b0c9a28
Received message: topic=test/topic, content_type=text/plain, payload=Test message 1, len=15

Blinky test is delivered to CI

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[SorinOlari]

I haven't found anything that breaks the application and everything seems to work fine.
Just a small change:)

[SorinOlari]

I think here should be CONFIG_MAX_TIMERS, 'S' is missing at the end

[kr-t]

Fixed - please review.