Add missing rocksdb_transactiondb_* to C binding

[lbguilherme]

I noticed some rocksdb_transactiondb_* are missing from c.cc. This patch adds:

• rocksdb_transactiondb_drop_column_family
• rocksdb_transactiondb_property_value
• rocksdb_transactiondb_property_int
• rocksdb_transactiondb_property_int_cf
• rocksdb_transactiondb_property_value_cf
• rocksdb_transactiondb_approximate_sizes
• rocksdb_transactiondb_approximate_sizes_cf

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[lbguilherme]

CI failed with "Build execution time has reached the maximum allowed time for your plan (90 minutes).". Doesn't seem related to this change.

[anand1976]

Can you add these to db/c_test.c so they get exercised?

[lbguilherme]

@anand1976 Added tests.