update the readme

ESP-IDF Component Continuous Integration (#229)

This pull request is meant to resolve #227 by adding continuous integration for publishing Libcanard to the [ESP Component Registry](https://components.espressif.com/).

Files added:
- `idf_component.yml`. This file contains required ESP component metadata.
- `Kconfig`. ESP components use this file as a standard way for controlling build options. I've added options for enabling/disabling assertions and the CRC table.
- `CMakeLists.txt`. This file is required to register the component with the ESP build system.
- `.github/workflows/esp_publish.yml`. This workflow uploads the component to the ESP-IDF registry whenever a new GitHub release is published.
- `.github/workflows/esp_dry_run.yml`. This workflow does a dry-run of uploading to the ESP-IDF registry, without publishing anything. It can only be manually triggered. I've tested this in my repository, and it seems to work.

The GitHub workflows require `IDF_COMPONENT_API_TOKEN` with an [ESP registry token](https://components.espressif.com/settings/tokens/) to be added to the repository secrets.

---------

Co-authored-by: Marcin Anforowicz <marcin.anforowicz@wibotic.com>
Co-authored-by: Pavel Kirienko <pavel.kirienko@gmail.com>

Introduce internal includes section to avoid potential implicit decla…

…ration warnings (#219)

During the integration of the `libcanard` into a project based on
[ChibiOS](https://www.chibios.org) I want to change `CANARD_ASSERT` from
the default `assert` to ChibiOS `osalDbgCheck`. It is done with the next
C defines `-DCANARD_ASSERT=osalDbgCheck
-DCANARD_CONFIG_HEADER=\"${BINDINGS_DIR}/canard/canard_config.h\"`,
there to prevent implicit declaration warnings I unutilized
`CANARD_CONFIG_HEADER` by providing a `canard_config.h` file with the
following content:
```
#include "osal.h"
```
But because of `#include "_canard_cavl.h"` and `# include
CANARD_CONFIG_HEADER` order in `canard.c` I still get implicit
declaration warnings:
```
Compiling canard.c
../../ext/OpenCyphal/libcanard/libcanard/_canard_cavl.h: In function 'cavlPrivateRotate':
<command-line>: warning: implicit declaration of function 'osalDbgCheck' [-Wimplicit-function-declaration]
../../ext/OpenCyphal/libcanard/libcanard/_canard_cavl.h:30:25: note: in expansion of macro 'CANARD_ASSERT'
   30 | #    define CAVL_ASSERT CANARD_ASSERT
      |                         ^~~~~~~~~~~~~
../../ext/OpenCyphal/libcanard/libcanard/_canard_cavl.h:98:5: note: in expansion of macro 'CAVL_ASSERT'
   98 |     CAVL_ASSERT((x != NULL) && (x->lr[!r] != NULL) && ((x->bf >= -1) && (x->bf <= +1)));
      |     ^~~~~~~~~~~
```

To resolve this issue `# include CANARD_CONFIG_HEADER` must be placed
before `#include "_canard_cavl.h"`.

Refactor the transfer reassembly state machine to enhance its maintai…

…nability and robustness (#215)

This is a step towards improving the transfer reassembler.

This changeset also renames `redundant_transport_index` as
`redundant_iface_index` for consistency with the other implementations;
this change is not visible at the API level.

Amend the transfer reassembly state machine and prepare v3.1 release (#…

…213)

Fixes #212

Fix 203 (#204)

* Fix #203

* Update the changelog

readme: update v3.0 release notes (#195)

Fix crush single message inside long message (#190)

* Add test for single message inside long message

* Fix crush single message inside long message

Co-authored-by: p.kuskov <p.kuskov@geoscan.aero>

Libcanard v2.0 (#182)

* Drop canard_dsdl, use Nunavut instead

* Upgrade CI to LLVM 13

* Actualize license headers

* Support redundant transmission queues and use more consistent public field naming

* Ditch the deprecated canardRxAccept(), rename canardRxAccept2()

* Refactor the API to eliminate the need to cast away const qualifiers; fixes #175

* Tighten up memory checking in the test suite -- add canaries

* Fix race condition in the roundtrip test

* Do not use Catch2 macros from non-main thread because it is not thread-safe

* Support CANARD_CONFIG_HEADER

* CI: add style_check job

* Use AVL tree in the transmission queue

* Remove all linked lists

* Reduce indirection, pointer casts, and memory footprint by exposing the AVL tree in the public API

* Disable C++-specific warnings as they make no sense for a C library

* Add table-based CRC option (#186)

* CI: disable SonarCloud on forks

* Add docker utilities (#187)

* Add acceptance filter configuration helpers (#171)

Co-authored-by: Kalyan Sriram <coder.kalyan@gmail.com>