Added ancient datadir flag and toml field

[pratikspatil024]

Added ancient datadir flag and toml field

TODO

• need to decide on default value
• update the conversion script

[codecov-commenter]

Codecov Report

Base: 56.83% // Head: 56.83% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (531d67a) compared to base (6cd5d15).
Patch coverage: 75.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##               qa     #614   +/-   ##
=======================================
  Coverage   56.83%   56.83%           
=======================================
  Files         598      598           
  Lines       69215    69223    +8     
=======================================
+ Hits        39341    39346    +5     
- Misses      26520    26522    +2     
- Partials     3354     3355    +1     

Impacted Files	Coverage Δ
internal/cli/server/config.go	72.09% <33.33%> (-0.28%)	⬇️
internal/cli/server/flags.go	100.00% <100.00%> (ø)
core/state_prefetcher.go	85.18% <0.00%> (-7.41%)	⬇️
eth/downloader/modes.go	17.24% <0.00%> (-6.90%)	⬇️
core/state/trie_prefetcher.go	74.80% <0.00%> (-3.82%)	⬇️
consensus/ethash/ethash.go	53.05% <0.00%> (-2.68%)	⬇️
p2p/peer.go	73.63% <0.00%> (-1.00%)	⬇️
eth/filters/api.go	41.13% <0.00%> (-0.71%)	⬇️
eth/downloader/fetchers_concurrent.go	53.74% <0.00%> (-0.69%)	⬇️
p2p/simulations/http.go	66.02% <0.00%> (-0.65%)	⬇️
... and 20 more

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