Set allow_update_..flags in client state to true

[ancazamfir]

Get clock drift from configuration

Closes: #785

Description

• set allow_update_..flags in tendermint client state builder totrue`
• get the clock drift from config

Note: the build_client_state() should eventually become parameterized once we allow parameters in hermes create client. This will be done in another PR.

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For contributor use:

• Updated the Unreleased section of CHANGELOG.md with the issue.
• If applicable: Unit tests written, added test to CI.
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Updated relevant documentation (docs/) and code comments.
• Re-reviewed Files changed in the Github PR explorer.

[codecov-io]

Codecov Report

Merging #828 (0c4e737) into master (b1b37f5) will increase coverage by 29.8%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #828      +/-   ##
=========================================
+ Coverage    13.6%   43.5%   +29.8%     
=========================================
  Files          69     170     +101     
  Lines        3752   12651    +8899     
  Branches     1374       0    -1374     
=========================================
+ Hits          513    5508    +4995     
- Misses       2618    7143    +4525     
+ Partials      621       0     -621     

Impacted Files	Coverage Δ
...application/ics20_fungible_token_transfer/error.rs	0.0% <ø> (ø)
...ion/ics20_fungible_token_transfer/msgs/transfer.rs	22.2% <ø> (ø)
..._transfer/relay_application_logic/send_transfer.rs	85.7% <ø> (ø)
modules/src/events.rs	0.0% <ø> (ø)
modules/src/handler.rs	100.0% <ø> (ø)
modules/src/ics02_client/client_consensus.rs	41.3% <ø> (ø)
modules/src/ics02_client/client_def.rs	31.6% <ø> (ø)
modules/src/ics02_client/client_state.rs	65.1% <ø> (ø)
modules/src/ics02_client/client_type.rs	79.1% <ø> (+31.5%)	⬆️
modules/src/ics02_client/context.rs	95.0% <ø> (ø)
... and 245 more

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