feat: record validation in TOML

[lucarin91]

❓ What

Make it possible to declare Record validation from TOML. A new Validation key is added in the TOML, where the user can set a regex for each of the field names.

[Validation]
name = “^[a-z]*$“
timestamp = “^[0-9]*“

To avoid conflicts the validation could be omitted or set just one time either on the Component object or in the TOML.

🔨 How to test

1. Add the Validation key on a Baker TOML
2. Make sure that no validation function is passed during the configuration
3. Records should be correctly validated and failed one throw away

✅ Checklists

• Is there unit/integration test coverage for all new and/or changed functionality added in this PR?
• Have the changes in this PR been functionally tested?
• Have new components been added to the documentation website?
• Has make gofmt-write been run on the code?
• Has make govet been run on the code? Has the code been fixed accordingly to the output?
• Have the changes been added to the CHANGELOG.md file?
• Have the steps in CONTRIBUTING.md been followed to update a Go module?

[arl]

Some comments here and there to update and the end-to-end test also, but the non-test code looks good to me.

Good job 👍

[codecov-io]

Codecov Report

Merging #122 (1cd3b63) into main (adc3a54) will increase coverage by 0.38%.
The diff coverage is 92.59%.

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   45.95%   46.33%   +0.38%     
==========================================
  Files          52       52              
  Lines        3669     3695      +26     
==========================================
+ Hits         1686     1712      +26     
  Misses       1791     1791              
  Partials      192      192              

Impacted Files	Coverage Δ
config.go	65.00% <92.59%> (+5.22%)	⬆️

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[arl]

LGTM