[mod] debug-log the bootload of the CURRENCIES caches (CurrenciesDB)

The time for the bootload is measured and recorded.  To have an eye on the
bootload time is motivated by: In [1] it can be seen that the bootload of the
CURRENCIES cache takes about 2/3 of the time required to initialize SearXNG::

    6.068 <module>  searx/webapp.py:1
    └─ 6.068 wrapper  pyinstrument/context_manager.py:52
       ├─ 5.538 init  searx/webapp.py:1373
       │  ├─ 4.822 initialize  searx/search/__init__.py:34
       │  │  ├─ 4.631 ProcessorMap.init  searx/search/processors/__init__.py:47
       │  │  │  ├─ 4.607 OnlineCurrencyProcessor.initialize  searx/search/processors/online_currency.py:55
       │  │  │  │  └─ 4.607 CurrenciesDB.init  searx/data/currencies.py:25
       │  │  │  │     ├─ 4.601 CurrenciesDB.load  searx/data/currencies.py:34
       │  │  │  │     │  ├─ 4.572 ExpireCacheSQLite.set  searx/cache.py:334

In the example, the CurrenciesDB.init call takes 4.6 seconds... on my laptop,
CurrenciesDB.init takes only 0.7 seconds.  The absolute numerical values depend
on external conditions, where I already find 4-5 seconds very long. Test::

    $ rm /tmp/sxng_cache_*.db*
    $ make run 2>&1 | grep "searx.data.CURRENCIES"
    DEBUG   searx.data : init searx.data.CURRENCIES
    DEBUG   searx.data : init searx.data.CURRENCIES added 9089 items in 0.7623255252838135 sec.

[1] https://github.com/searxng/searxng/issues/5223#issuecomment-3323083411

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

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