feat: improvements according to application note AN5289

[gabrielsantosphilips]

Updates according to AN5289 document:

6.8 - 2 Mbps

• Constructor sets the default PHY to 2 Mbps.

6.9 - Update connection parameters

• The function aci_gap_start_connection_update should be invoked only if a parameter update is requested, as we don't have an interface defined to do that, it is pointless keeping this function on code base.

7.6.9 - Maximize data throughput

• Connection parameters:
  • Connection interface: 7.5 ms (document suggests 400 ms, but this slows down the entire execution flow).
• Function hci_le_set_data_length kept, after the connection is established, data length is configured to 251 octets.

[github-actions]

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