Added getFormattedDateTime method

[leodrivera]

Implement getFormattedDateTime, which has the advantage, when compared #94 that does not rely on external lib and parse more patterns. The #161 was used as base, however, I had to change all the calculation logic, as the results were not correct

Patterns

  %Y: Full year (e.g., 2023)
  %y: Last two digits of the year (e.g., 23 for 2023)
  %m: Month as a zero-padded decimal number (01 to 12)
  %d: Day of the month as a zero-padded decimal number (01 to 31)
  %H: Hour (00 to 23) as a zero-padded decimal number
  %M: Minute as a zero-padded decimal number (00 to 59)
  %S: Second as a zero-padded decimal number (00 to 59)
  %a: Abbreviated weekday name according to the current locale
  %A: Full weekday name according to the current locale
  %w: Weekday as a decimal number (0 for Sunday through 6 for Saturday)
  %b: Abbreviated month name according to the current locale
  %B: Full month name according to the current locale
  %p: "AM" or "PM" based on the hour (Note: This is locale-sensitive and might not be applicable in all languages)

With this new method, getFormattedTime loses the meaning of existing, given that we can obtain the same result through the parameter "%H:%M:%S"

timeClient.getFormattedDateTime("%H:%M:%S")

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Memory usage change @ 3b359eb

Board	flash	%	RAM for global variables	%
esp8266:esp8266:huzzah	N/A	N/A	N/A	N/A

Click for full report table

Board	examples/Advanced flash	%	examples/Advanced RAM for global variables	%	examples/Basic flash	%	examples/Basic RAM for global variables	%	examples/FormattedDateTime flash	%	examples/FormattedDateTime RAM for global variables	%	examples/IsTimeSet flash	%	examples/IsTimeSet RAM for global variables	%
esp8266:esp8266:huzzah	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A

Click for full report CSV

Board,examples/Advanced<br>flash,%,examples/Advanced<br>RAM for global variables,%,examples/Basic<br>flash,%,examples/Basic<br>RAM for global variables,%,examples/FormattedDateTime<br>flash,%,examples/FormattedDateTime<br>RAM for global variables,%,examples/IsTimeSet<br>flash,%,examples/IsTimeSet<br>RAM for global variables,%
esp8266:esp8266:huzzah,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A

[github-actions]

Memory usage change @ 5b5c317

Board	flash	%	RAM for global variables	%
esp8266:esp8266:huzzah	N/A	N/A	N/A	N/A

Click for full report table

Board	examples/Advanced flash	%	examples/Advanced RAM for global variables	%	examples/Basic flash	%	examples/Basic RAM for global variables	%	examples/FormattedDateTime flash	%	examples/FormattedDateTime RAM for global variables	%	examples/IsTimeSet flash	%	examples/IsTimeSet RAM for global variables	%
esp8266:esp8266:huzzah	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A

Click for full report CSV

Board,examples/Advanced<br>flash,%,examples/Advanced<br>RAM for global variables,%,examples/Basic<br>flash,%,examples/Basic<br>RAM for global variables,%,examples/FormattedDateTime<br>flash,%,examples/FormattedDateTime<br>RAM for global variables,%,examples/IsTimeSet<br>flash,%,examples/IsTimeSet<br>RAM for global variables,%
esp8266:esp8266:huzzah,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A