feat(sdk): Rename (export|import)_keys to (export|import)_room_keys

[Hywan]

More or less related to #1016.

After a discussion with @poljar, we agreed it was necessary to rename some methods and functions, so that it's more explicit about what they do.

This is a set of 4 patches that rename:

• OlmMachine.export_keys to .export_room_keys,
• OlmMachine.import_keys to .import_room_keys,
• encrypt_key_export to encrypt_room_key_export,
• decrypt_key_export to decrypt_room_key_export.

[codecov]

Codecov Report

Base: 78.46% // Head: 78.46% // No change to project coverage 👍

Coverage data is based on head (782b256) compared to base (c0ebeee).
Patch coverage: 92.85% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1058   +/-   ##
=======================================
  Coverage   78.46%   78.46%           
=======================================
  Files         110      110           
  Lines       15111    15111           
=======================================
  Hits        11857    11857           
  Misses       3254     3254           

Impacted Files	Coverage Δ
crates/matrix-sdk-crypto/src/lib.rs	100.00% <ø> (ø)
crates/matrix-sdk/src/encryption/mod.rs	37.50% <0.00%> (ø)
...atrix-sdk-crypto/src/file_encryption/key_export.rs	98.49% <100.00%> (ø)
crates/matrix-sdk-crypto/src/machine.rs	81.29% <100.00%> (ø)

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